"Prior permission for the foreigners to visit North will be implemented and foreigners or relevant organisations have to write to Defence Ministry for approval," the government's information department said in a statement.
Last week during President Mahinda Rajapaksa's visit to the province, the military had imposed a ban on foreigners' entry to the Northern Province, where ethnic Tamils continue to accuse the government of human rights violations since the military crushed a separatist movement there in 2009.
Foreign nationals were turned back at Omanthai, the army controlled entry point to the North on the A9 highway.
