I believe that is a bit early in the season but might be doable. I've been in June-July-August. I was pleased with July and August but maybe just got unlucky with June.
Check out these guys: http://www.srilankakiteschool.com/
Location is great. Small lagoon with ocean on the other side. Absolutely nothing to do there though aside from kite. Your entertainment is really just the other kiters that happen to be there or whomever you bring.