Here are well-regarded 5‑star resorts in Sri Lanka that offer ocean views (grouped by region). I’ve listed one-line highlights and an authoritative source for each so you can check photos, availability and exact beachfront/sea‑view room options.

Southern coast (Galle / Mirissa / Weligama / Tangalle)

• Cape Weligama — cliff‑top luxury resort with dramatic Indian Ocean views and private villas/terraces. (reservations.com)
• Weligama Bay Marriott Resort & Spa — large 5★ beachfront resort overlooking Weligama Bay (sea‑view rooms & beach access). (us.trip.com)
• Cape Weligama (repeat for clarity if comparing cliff vs beach) — see above. (reservations.com)
• Amanwella (Tangalle) — intimate Aman resort with suites and plunge pools facing a crescent beach and clear ocean views. (fivestaralliance.com)
• Anantara Peace Haven Tangalle — clifftop/resort with beachfront access and cliffside dining overlooking the Indian Ocean. (Anantara.com)
• The Fortress Resort & Spa (Galle) — beachfront luxury property near Galle with rooms and suites offering direct ocean views. (thefortress.in)

South‑west coast / Bentota

• Cinnamon Bentota Beach — Geoffrey Bawa–designed 5★ hotel right on Bentota’s coastline (classic beachfront property). (en.wikipedia.org)
• Taj Bentota Resort & Spa (Taj usually operates Taj Samudra in Colombo; check current branding for Bentota) — notable Taj properties in coastal Sri Lanka typically offer ocean views; confirm current names/management. (en.wikipedia.org)

Colombo (city oceanfront)

• Taj Samudra, Colombo — long‑standing 5★ hotel directly facing Galle Face Green and the Indian Ocean (ocean‑view rooms available). (en.wikipedia.org)
• Shangri‑La Colombo (One Galle Face) — luxury 5★ skyscraper hotel in the One Galle Face complex with ocean‑facing rooms and rooftop views. (en.wikipedia.org)
• NH Collection / Mövenpick (Colombo) and other 5★ city hotels — several Colombo 5★ hotels line Galle Road or face the bay; many offer sea‑view rooms — check individual hotel pages for “sea‑view” room categories. (en.wikipedia.org)

Other notable ocean‑view luxury options

• Cape‑style and boutique oceanfront hotels near Galle/Unawatuna (e.g., The Fortress, KK Beach, boutique cliff hotels) — many smaller 5★/luxury boutique properties provide direct ocean panoramas and private terraces. (thetimes.co.uk)

Notes and quick tips

• “Ocean view” can mean cliff‑top panoramas (excellent vistas but sometimes limited beach access) or true beachfront (easy sea access). Check the room category (ocean‑view, sea‑facing balcony, villa with plunge pool) on the hotel site or booking page.
• Peak season on the southern coast is generally November–April (calmer seas and best beach weather); Tangalle/Arugam Bay seasons differ — verify dates for the specific area before booking.
• If you’d like, I can: (a) narrow these to a specific area (Galle vs Bentota vs Tangalle vs Colombo), (b) pull current room examples/prices for selected resorts for your travel dates, or (c map these properties so you can compare locations.

Which option would you like next (region, dates, or map)?