sri lanka is probably not the destination for good surf.
in january you can also check out the aceh area on sumatra they have NE monsoon offshores and you can surf really empty stuff there. and really cool little isalnds on the nw tip of sumatra (with excellent waves (pulau breueh)and snorkeling (pulau we) ).
Ujung Bocur /south sumatra has NW winds in off season so you have cross onshore. bali off season should also be ok and more swell down there. but no disconnect.
disconnect on the cheap would also be panaitan island. Monster surf and national park. but i don't think a lot of intermediate friendly waves except "inside rights." which is offshore in the january nw winds 
on the plus side: no real settlement on the island and super disconnect
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