After the government of President Mahinda Rajapakse came to power in November last year, 860 security personnel and 549 civilians were killed between December 1 to October 25, the defence ministry said.
It said security forces had also killed 1,880 Tamil Tiger guerrillas and wounded 1,303 others.
The fighting came despite a truce arranged and put in place by peace broker Norway in February 2002. The violence has flared anew following failed peace talks in Geneva last month.
There was no immediate word from the Liberation Tigers of Tamil Eelam (LTTE) about the defence ministry's casualty figures.
However, the rebels announced in Geneva last week that 870 civilians had been killed by government forces and paramilitary units since their previous round of negotiations in February.
Sri Lanka's key international backers -- the United States, the European Union, Japan and Norway -- have asked both sides to refrain from hostilities and resume observation of the cease-fire.
The key backers have said the island risked losing financial support unless both sides showed progress towards a political solution to a conflict which has claimed more than 60,000 lives since 1972.

Copyright AFP (Agence France-Presse), 2006