Here are top luxury private villas along Sri Lanka’s south coast (Galle → Tangalle corridor), with a short description, location, standout features and where to check availability. I focused on well-reviewed, high-end properties popular with families, groups and honeymooners.

1. The Nine Mirissa — Mirissa

• Why go: Large, dramatic designer villa built over nine levels with expansive ocean and bay views; excellent for big groups.
• Highlights: 7 bedrooms, elevator, multiple terraces and big indoor/outdoor living spaces.
• Book/see: villa listings and reviews on Ministry of Villas. (ministryofvillas.com)

2. Ubuntu Beach Villas — Mirissa

• Why go: Exclusive beachfront compound style villas right on the sand; high-end staff service.
• Highlights: Multiple en-suite bedrooms, direct beach access, private pool, fully staffed.
• Book/see: Ministry of Villas listing. (ministryofvillas.com)

3. Red Cliffs / Pradeep Jayewardene House — Mirissa (also called “Red Cliffs”)

• Why go: Architecturally important tropical‑modernist villa (Geoffrey Bawa connection) on dramatic cliffs above Weligama Bay — iconic, historic setting.
• Highlights: Pavilion-style design, cliff-top views, limited private bookings.
• Read more: Wikipedia / property pages. (en.Wikipedia.org)

4. Suriyawatta — Weligama

• Why go: Luxe modern‑colonial beachfront villa with terraced gardens descending to the beach — good blend of privacy and proximity to local attractions.
• Highlights: Beach access, private pool, staff service; close to Weligama/Mirissa activities.
• Book/see: Ministry of Villas listing. (ministryofvillas.com)

5. Villa Tanderra — Tangalle / Kalametiya area

• Why go: Private, pristine beachfront villa on a quiet stretch near Tangalle — excellent for birding, sunset views and total seclusion.
• Highlights: Secluded beach/lagoon setting, 40-foot pool, private chef and staff.
• Book/see: official Villa Tanderra site. (villatanderra.com)

6. Siri Wedamadura — Mirissa

• Why go: Elegant colonial‑style villa set in lush gardens a short walk from Mirissa Beach — good mix of style and location.
• Highlights: 4 bedrooms, garden grounds, popular with families/friend groups.
• Book/see: Ministry of Villas listing. (ministryofvillas.com)

7. Villa 49 / Villa 95 (examples near Mirissa / Hiriketiya)

• Why go: Contemporary luxury villas favored by surfers and families — private pools, A/C rooms, close to surf breaks (Hiriketiya, Mirissa).
• Highlights: Modern amenities, private pools, staffed options; great for active travellers.
• See curated villa guides for surfing south coast. (villainsrilanka.co.uk)

8. Other high-end options to consider (resorts with private villas)

• Cape Weligama (Galle area) — resort villas/clifftop suites that offer villa-like privacy with five-star hotel services. (Mentioned frequently in luxury villa roundups). (theaustralian.com.au)

Quick booking tips

• For the best rates and reliable service on high-end properties check specialist villa agencies (Ministry of Villas, local villa specialists, or the villa’s official site). Many villas are fully staffed and priced per night for exclusive use. (ministryofvillas.com)
• If you want privacy + resort facilities, compare private villas vs resort villa suites (e.g., Cape Weligama). (theaustralian.com.au)
• Travel note: South coast weather is seasonal (monsoon patterns) — check the local climate for your intended dates before booking.

If you’d like, I can:

• narrow these to a specific town (Galle, Mirissa, Weligama, Tangalle);
• filter by number of bedrooms, private chef/staff, or pool;
• check availability and current nightly rates for specific dates (I can search those now).