Great — here are vetted eco-friendly yoga & meditation retreat options in Sri Lanka, with short notes on location, sustainability focus, typical programs and cost hints. I’ve included links to each source so you can check dates/availability and book directly.

Top eco-friendly yoga & meditation retreats in Sri Lanka

1. Sen Wellness Sanctuary — Rekawa / Southern coast (lagoon + beach)

• What: boutique Ayurveda + yoga + meditation sanctuary focused on nature healing and turtle-nesting habitat protection. Eco-conscious accommodation (cabanas), local-sourced menus and conservation commitments. (senwellnesssanctuary.com)

2. Polwaththa Eco Lodges — near Kandy / central highlands

• What: family-run jungle eco-lodge offering multi-day yoga & meditation retreats, guided nature treks, planting/reforestation options and community activities. Clear sustainability ethos (reduce/reuse/recycle, local sourcing). Typical retreat packages and prices are posted on their site (4–7 day offerings). (polwaththa-ecolodges.com)

3. Welikande Estate Yoga Retreat — Knuckles Mountain Range (central hills)

• What: an eco-friendly estate retreat offering rolling / all‑inclusive yoga retreats amid tea/forest landscapes overlooking the Knuckles Range; emphasis on slow, nature-centred stays. Good for longer stays and immersions. (welikandeyogaretreats.com)

4. Lanka Yoga / Balance with Lanka — Koggala Lake (south coast)

• What: purpose-built, resource‑aware yoga campus on Koggala Lake used for week retreats and teacher trainings; built and run with ecological and community responsibility in mind. Popular for teacher trainings and group retreats. (lankayoga.lk)

5. Arana Eco Lodge & Yoga Centre — Ella (hill country)

• What: small eco-lodge near Ella focused on forest‑monastery atmosphere, simple sustainable accommodation and daily yoga in a natural setting — good for meditative hillside retreats. (aranasrilanka.lk)

6. Kaju Green (Kaju Green Eco Lodges) — southern coast / near national park

• What: small eco-lodge running regular vinyasa/retreat weeks in an eco setting (salt-water pool, nature activities); positions itself as an eco-resort with local activities. (Check site for current retreat dates/prices.) (kajugreen.com)

7. Small teacher-led / pop-up retreats at Lanka Yoga / independent teachers

• What: many international teachers run eco-friendly “pop-up” retreats at Sri Lankan eco-venues (e.g., Lanka Yoga / Koggala or local eco-lodges). These typically combine daily yoga, meditation, breathwork, plant-based meals and local excursions — check teacher event pages for current schedules. (lankayoga.lk)

When to go

• For south & west coast and the central highlands (Kandy, Ella, Galle, Koggala): December–March is generally the driest, sunniest period and the most popular for retreats. If you plan to visit the east coast instead (Trincomalee/Arugam Bay), the better season is roughly May–September. (Weather patterns vary by region — check current forecasts before booking.) (srilankatourisminfo.com)

Practical booking & sustainability tips

• Verify current retreat dates, exact program and inclusions on each retreat’s website before paying. Many places run rolling arrivals (join any week) while others run fixed-date teacher-led retreats.
• Ask the retreat directly about specific sustainability practices you care about: waste management (composting/recycling), water-saving measures, use of single‑use plastics, support for local communities, sourcing of food, and wildlife protection (important near nesting beaches).
• For a lower-impact stay, choose places that use local staff, serve mostly plant-based/local food, prioritize low-energy lighting and natural ventilation, and offer ways to contribute (tree planting, community visits) rather than high-impact excursions.
• If you’re travelling from the U.S.: check visa/entry and travel-health requirements and confirm internal travel (train, private transfer) options with the retreat. Many retreats offer airport or station pickups.

How I selected these

• I prioritized small, locally-run eco-lodges and purpose-built yoga centres that explicitly state environmental or community commitments and run regular yoga/meditation programs. Sources: retreat websites and Sri Lanka travel guides. (senwellnesssanctuary.com)

Would you like:

• direct links and contact details for 2–3 of these retreats so you can compare dates and prices now? (I can fetch current availability/prices for specific dates if you want.)