Great — here are top spa hotels across Sri Lanka (grouped by type) that are well-rated for a relaxing, wellness-focused stay. I’ve included the key spa strengths and a source for each so you can check treatments, packages and location.

Luxury beach + cliff-top spas

• Cape Weligama (Weligama) — cliff-top villas, in‑villa and Sanctuary Spa treatments using local ingredients (Ceylon tea, spice scrubs) and signature Ayurveda experiences. (resplendentceylon.com)
• Amanwella (Tangalle) — intimate luxury beach resort with in‑suite and beachfront treatments, yoga platform and extensive massage/facial menu. (aman.com)
• Anantara Peace Haven Tangalle — full Anantara spa with Ayurvedic programmes, treatment rooms, yoga pavilion and multi‑day wellness packages. (anantara.com)

Wellness destination / hill country

• Santani Wellness Resort (near Kandy) — destination wellness resort with tri‑level hydrotherapy spa, personalised wellness and Ayurveda programmes, sauna/steam and structured packages. (santani.com)

Cultural Triangle & eco‑spa

• Jetwing Vil Uyana (Sigiriya) — eco-luxury spa set in wetlands; Balinese/Ayurvedic therapies, steam room, plunge pool and nature-focused wellness. (jetwinghotels.com)
• Uga Ulagalla (Thirappane / near Sigiriya) — secluded villa resort with a rustic, wattle‑walled spa set in jungle/ paddy fields; good for relaxed, private treatments. (ugaescapes.com)

Boutique coastal & safari spa options

• The Fortress Resort & Spa (Galle / Koggala) — well‑reviewed beachfront spa (Spa Naturel) offering Ayurvedic rituals plus international therapies; close to Galle Fort. (thefortress.in)
• Uga Chena Huts (Yala) — luxury safari property with an intimate spa offering aromatherapy, massages and treatments to unwind after game drives. (ugaescapes.com)

Iconic / landmark spa hotel

• Heritance Kandalama (Dambulla) — dramatic architecture integrated with nature and a “Divine Spa” offering Ayurveda, aromatherapy and body rituals — convenient for cultural triangle sightseeing. (heritancehotels.com)

Quick planning tips

• Best season: for the south & west coast (Galle, Tangalle, Weligama, Colombo) aim for December–March; the east coast is best April–September. (Regional weather varies — check timing against where you want to relax). (lonelyplanet.com)
• If you want authentic Ayurvedic programmes, look for resorts that list a resident Ayurvedic doctor and multi‑day packages (Santani, Anantara and several Heritance/Jetwing properties do). (santani.com)
• Book spa treatments (and any Ayurveda consultation) in advance — slots and resident doctors can fill up, especially in high season.

If you’d like, I can:

• Narrow these to a specific region (south coast, hill country, Cultural Triangle, or east coast),
• Compare 2–3 you’re considering by price, spa packages and distance from airports, or
• Check current availability/rates for specific dates.