Here are five highly regarded 5‑star beachfront hotels in Sri Lanka — each is a luxury, beach-front property popular with international travelers. I’ve included a short note on why each is recommended and a source you can check for current rates/reviews.

1. Cape Weligama (Weligama — southern coast) — Luxury cliff-top resort with villas and suites, dramatic Indian Ocean views, multiple dining venues and strong service; great base for surfing and coastal tours. (en.Wikipedia.org)

2. Amanwella (Tangalle — southern coast) — Small, high‑end Aman resort set in a coconut grove with an 800 m crescent beach, contemporary suites (many with private plunge pools) and a reputation for quiet, intimate service. (fivestaralliance.com)

3. Anantara Peace Haven Tangalle Resort (Tangalle — southern coast) — Large luxury resort on a rocky/ sandy coastline with extensive grounds, multiple restaurants and strong spa and activity offerings; well suited for families and couples. (tripadvisor.com)

4. The Fortress Resort & Spa (Koggala / near Galle — southern coast) — Stylish beachfront resort known for its design, good dining options and award‑winning spa; convenient for visiting Galle Fort and southern attractions. (en.Wikipedia.org)

5. Heritance Ahungalla (Ahungalla / between Bentota and Galle — southern coast) — Established 5‑star beachfront resort (historic property by Aitken Spence) with extensive facilities, long beach frontage and family-friendly amenities. (en.Wikipedia.org)

Honourable mentions (also beachfront 4–5 star luxury properties you may want to consider): Shangri‑La Hambantota, Jetwing Lighthouse (near Galle), Anantara Kalutara, Uga Bay / Uga Chena Huts (south/east), and Cape Negombo / Negombo luxury beachfront options.

If you’d like, I can:

• Filter these by region (south coast vs west coast vs east coast), price range, or traveler type (couples, families, surf/whale‑watching); or
• Check live room availability and typical nightly rates for specific dates (I’ll look these up for the dates you plan to travel).