The Sri Lanka Ports Authority said the move followed a visit to the island by a security firm which provides maritime intelligence in response to lobbying by government with the end of the country's ethnic war.
On June 9 London underwriters announced they have removed Sri Lanka from the area listed for war risk insurance.
A statement from the Joint War Committee in London said it recently reviewed the Listed Areas for Hull War, Strikes, Terrorism and Related Perils, last altered on March 11, 2010, and deleted Sri Lanka.
The risk rating was reduced last year after the 30-year ethnic war ended in May with the defeat of Tamil separatists.
The SLPA statement said the removal of Sri Lanka from the area listed for war risk will give a "tremendous boost" to the economy, especially to the port of Colombo to be attractive compared to regional ports.
It said the Joint War Committee's decision would ensure that all Sri Lankan ports are "free of any war related risks and additional war risk