Sirisena chaired his first meeting of the national security council, a week after assuming office.
"In view of the improved security situation and normalisation of life it was decided to lift travel restrictions imposed on foreign passport holders to the north," military spokesman Brigadier Ruwan Wanigasuriya said.
The previous administration of President Mahinda Rajapaksa in October had issued the new travel restrictions which required foreigners to seek prior permission when travelling to the north.