This reply is a year late, so will be no help and you'll never see it (there are so many threads that some just disappear).
But if anyone else is interested, go to Galle, Sri Lanka. It's by far the most heavily visited port by yachts in South Asia
, though occasionally I saw boats anchored off Cochin (Kerala) and Panjim (Goa) in India
The boats in Galle will mostly be headed west to the Red Sea and to Africa
(Dec-March) or south to Chagos
, but then in lesser numbers will start sailing the other way, to the Andaman, before the tropical storm season.