You can go surfing at both costs of Sri Lanka, which have two different season due to monsoon winds. The eastern shores are definitely considered the best. Famous Arugam bay hosts the annual UK Pro-Surfing Association’s Sri Lanka Surf Championships during this period.
The beaches are really beautiful and surfer friendly providing everything you'll need. The coast on the edge of Yala East National Park is also great to spot elephants and other animals. Arugam Bay suits both beginners and pros so chase the waves yourself, or watch the others doing it for you!