There are manyNational Parks you can visit in Sri Lanka. Yala is the
largest national park. The National Parks of Sri Lanka are managed by
the department of Wild Life and Conservation. National Parks are bit
different from Wild Life sanctuaries which allow free movements. You
need to obtain permission and a guide provided by the park. You are not
supposed to get out from the vehicle under any circumstances.
You need drive a 4 WD vehicle and stay only in specified roads.
Yala National Park

Udawalawe National Park
Wasgomuwa National Park
Maduraoya National Park
Weerawila national park
Horton Plains National Park
Bundala National Park
Willpattu National Park
Kumana National Park
Minneriya National Park
Giritale National Park
Habarana National Park
Lahugala National Park
Galoya National Park
Randenigala Santuary