Here are highly regarded luxury properties across Sri Lanka that offer private pools (private plunge/infinity pools, villa pools, or private/semi-private pool suites). I’ve grouped them by region and included one-line notes plus a source for each.

South coast (Bentota → Tangalle → Weligama)

• Cape Weligama (Weligama) — cliff-top villas and residences with private or semi‑private infinity pools (some villas have a private 15 m infinity pool). (resplendentceylon.com)
• Anantara Peace Haven Tangalle (Tangalle) — beach pool villas and ocean view pool villas with private plunge pools and villa host service. (Anantara.com)
• Jetwing Saman Villas (Bentota) — villa suites and Grand Deluxe / Villa Suite categories that include private garden lap pools. (jetwinghotels.com)

South / Yala coast and wild coast

• Wild Coast Tented Lodge (near Yala) — luxury tented suites (cocoons) with private plunge pools in many units for a secluded safari‑by‑sea experience. (vanityfair.com)
• Chena Huts by Uga Escapes (Yala coast) — private villas/clusters with private or shared small pools and intimate beach/jungle setting. (expressionsholidays.co.uk)

Cultural/North-central & interior

• Ulagalla by Uga Escapes (near Anuradhapura / Sigiriya area) — standalone villas set across the estate, most villas include private plunge pools. Good for heritage/elephant‑country stays. (steuartholidays.com)

West coast / Negombo & airport area

• Jetwing Thalahena Villas (Negombo) — boutique villa property; Master Suite / some suites feature a private pool and private deck (convenient for arrivals/departures). (jetwinghotels.com)

Other notes and tips

• “Private pool” can mean fully private (accessible only from your villa) or semi‑private (shared by a small cluster of villas). Check the room/ villa description and photos before booking. (Source examples above show both types.) (resplendentceylon.com)
• If you want quieter privacy (honeymoon or family take‑over), ask properties about full‑villa booking and whether the pool is exclusive to the unit. Many resorts will confirm on request. (resplendentceylon.com)

Would you like:

• options filtered by specific area (e.g., Mirissa, Tangalle, Bentota, Yala),
• a shortlist within a price band or for honeymoon/family needs, or
• help checking availability/rates for particular dates (I can look those up)?