Samaraweera took a career-best 4-49

Bangladesh youngster Mohammad Ashraful, who scored 114 against Sri Lanka last year, compiled a determined 75.

But his efforts were in vain as his side lost their last five wickets for 17 runs, with Sujeewa de Silva and off-spinner Thilan Samaraweera claiming four wickets apiece.

It was Sri Lanka's 10th successive Test victory at home since September 2001, including 3-0 sweeps overs the West Indies and Zimbabwe.

Bangladesh, resuming at 103-4, offered resistance only in the opening hour as overnight batsmen Ashraful and debutant Alok Kapali extended their fifth-wicket stand to 68.

The 25-year-old Samaraweera, who had taken just five wickets in his previous nine Tests, began the slide when he had Kapali caught bat-pad by Jehan Mubarak at short-leg for 23.

The spinner struck a vital blow in his next over when he had the well-set Ashraful caught by close-in fielder Mubarak.

Ashraful struck 12 fours in his 120-ball knock.

The two sides now meet in three one-day internationals, the first on Monday.

Sri Lanka: Sanath Jayasuriya (captain), Jehan Mubarak, Michael Vandort, Naveed Nawaz, Thilan Samaraweera, Prasana Jayawardena, Upul Chandana, Hashan Tillakaratne, Buddika Fernando, Sujeeva de Silva, Chamila Gamage.

Bangladesh: Khaled Mashud (captain), Habibul Bashar, Al-Sahariar, Tushar Imran, Fahim Muntasir Abdul Hannan Sarkar, Manjural Islam, Alamgir Kabir, Talha Jubair, Mohammad Ashraful, Alok Kopali, Tapash Baisya.

Umpires: David Shepherd, Steve Bucknor.

Third umpire: Peter Manuel.

Referee: Wasim Raza.