Great — here are top beach (and beachfront) wedding venues across Sri Lanka, with short notes on location, vibe, typical capacity, and why couples pick them. I’ve included official / recent sources so you can check packages, capacities and availability directly.

1. Anantara Peace Haven Tangalle (Tangalle / South Coast)

• Vibe: Luxurious cliff-and-beach resort with dramatic ocean views — suited for sunset ceremonies, intimate to medium-size celebrations.
• Capacity: several options (private bungalow/cliff settings for up to ~200).
• Why choose: striking cliff-top and beachfront photo locations, full-service resort wedding planning and luxury stay for guests. (Anantara.com)

2. Amanwella (near Tangalle / South Coast)

• Vibe: Ultra-luxury, minimalist resort with a private crescent beach and intimate, private ceremony options.
• Capacity: best for small-to-medium weddings (ideal up to ~80–100 guests; exclusive-resort takeovers possible).
• Why choose: privacy, strong aesthetic for photos, private beach club and poolside event options. (beyondweddings.com)

3. Jetwing Lighthouse / Jetwing Blue / Jetwing Beach (Galle & Negombo areas)

• Vibe: Jetwing Lighthouse (Galle) — colonial charm on rocky headland with ocean vistas; Jetwing Blue / Jetwing Beach (Negombo) — convenient, wide sandy beaches near Colombo Airport.
• Capacity: venues across the brand handle intimate ceremonies to large receptions (some ballrooms/banquets up to 500+ depending on property).
• Why choose: reliable wedding teams, multiple venue options (beach, lawns, ballrooms), good logistics (Jetwing Blue is especially convenient for international guests). (jetwinghotels.com)

4. Galle Face Hotel (Colombo — beachfront promenade)

• Vibe: Iconic, historic Colombo hotel right on the seafront — classic, colonial elegance with ocean backdrop for sundown ceremonies.
• Capacity: wide range from intimate to very large (Chequerboard sundown space and ballrooms accommodate hundreds).
• Why choose: heritage atmosphere with ocean views and easy access from Colombo. (gallefacehotel.com)

5. Shangri‑La Hambantota (South / Hambantota)

• Vibe: Large luxury resort with extensive beachfront lawns and contemporary ballrooms — good for multi-day destination events.
• Capacity: very large (ballrooms and lawns that can host hundreds to over a thousand for grand celebrations).
• Why choose: ideal for large-scale weddings, resort buyouts, and guests wanting lots of facilities and activities nearby. (Shangri-La.com)

6. Cinnamon Bentota Beach (Bentota / South-West Gold Coast)

• Vibe: Classic beach-resort setting on Sri Lanka’s “Gold Coast” with both beach and garden event spaces.
• Capacity: flexible (ballrooms and outdoor areas suitable for medium-to-large receptions; ballroom up to ~350 cited).
• Why choose: combination of coastal beauty and well-established event infrastructure. (cinnamonhotels.com)

7. AVANI / AVANI Kalutara (Kalutara)

• Vibe: Peninsula between river and sea — offers both beachfront and riverside ceremony options; relaxed, tropical feel.
• Capacity: suitable for small-to-medium weddings and resort events.
• Why choose: different scenic backdrops within the same property and good coastal accessibility from Colombo. (marriage.market)

8. Smaller/private villas and boutique hotels (examples: boutique Tangalle/Tangalle bay villas, private beach villas near Galle)

• Vibe: Highly private, tailor-made barefoot weddings — great for elopements or intimate ceremonies.
• Capacity: typically best for very small guest lists (up to ~30–80 depending on villa).
• Why choose: exclusivity, custom décor, and highly personalized service. (Search villa specialists or contact local wedding planners for options.)

Quick planning tips

• Season: South- and west-coast beaches are usually best November–April (drier); east coast (Trincomalee, Arugam Bay) peaks May–September. Confirm exact weather windows for your target venue/date with the hotel.
• Permits & paperwork: if you’re having a legally binding Sri Lankan ceremony, ask the resort about legal requirements, residency/ETA and document translation — many hotels provide legal-arrangements services.
• Guest logistics: if many international guests are flying in, consider venues near Bandaranaike International Airport (Colombo/Negombo) or plan group transfers.
• Ask each property for a wedding brochure, sample menus, capacity breakdowns and whether they offer full wedding planning, décor, and photographer recommendations.

Would you like me to:

• compare 2–3 of these venues by budget, guest capacity and travel logistics, or
• find contact links and current wedding-package brochures for specific properties (I can pull the latest pages)?