Pakistan were bowled out for 216 in their second innings with left-arm spinner Rangana Herath taking a career-best 4-64.

Herath, whose previous best was 4-92 against Australia in Colombo earlier this year, took four of the six wickets that tumbled on the fifth and final day in an unchanged spell of 18.2 overs.

After resuming at 114-4 Shoaib Malik and Yousuf Youhana frustrated the tourists with a stand of 63 runs for the fifth wicket.

But Sri Lanka hit back by taking three wickets off 14 deliveries in the space of just five runs, to leave Pakistan 170-7 at lunch.

Youhana and Malik survived the first hour as the bowlers pressed hard for an early breakthrough.

Youhana pulled Herath for two consecutive boundaries but the left-armer finally trapped him leg before wicket. Youhana batted 150 minutes to patiently build his 44.

Herath then removed Abdul Razzaq with the first ball of his next over for nought. Moin Khan averted a hattrick only to edge Chaminda Vaas to wicketkeeper Romesh Kaluwitharan in the next over after making one.

Malik added an invaluable 28 runs for the eighth wicket with Mohammad Sami who was run out soon after lunch for 6.

Malik then decided to hit out, taking three boundaries off Dilhara Fernando to reach his maiden half-century with ten boundaries.

But a slow delivery from Herath had Malik caught and bowled for 59 and then stumped Shoaib Akhtar for 12 as Sri Lanka scored a thumping victory.

Sri Lanka had set Pakistan a world record-equalling 418 to win the Test after their star batsman Sanath Jayasuriya played an epic innings of 253 to help them post a second innings score of 438 on Saturday.

This becomes Sri Lanka's biggest win over Pakistan in terms of runs, beating their 144-run win against Pakistan at Sialkot in 1995.

The second and final Test starts in Karachi on October 28.