Who is the best bowler in sri lanka

Sanath Jayasuriya.

Explanation:

He's the greatest Sri Lankan Cricketer ever born.Sanath Jayasuriya has been at the vanguard of Sri Lanka's ascent as a cricketing power, and his rise as a feared international batsman has coincided with Sri Lanka's rise as a force to be reckoned with in international cricket.  

Jayasuriya started his career as a fairly non-descript utility player who had an ability to smack the ball hard. His performances stayed ordinary for much of his early career. In fact, from his debut in 1989 till 1995, Jayasuriya had never ended a year with an average above 30 in ODIs and had played only a handful of Tests.