The countries that will be included in the visa on arrival programme include Austria, the UK, the US, Japan, Australia and Canada. The island nation received 7,40,600 foreign tourists in the first three months of 2019.
The group said the gathering will decide who to back in the presidential elections later this year in the Indian Ocean island nation where Buddhists make up about 70% of the population. The rest include ethnic Tamils, who are mostly Hindus, and Muslims.
There was no immediate word from the government on why Sirisena changed his mind and extended the emergency period, but security remains tight in the capital. However, Emergency can only be declared for a month at a time, and parliament must ratify it within 10 days.
On Saturday, Sirisena sacked national intelligence chief Sisira Mendis who reportedly said that the attacks could have been avoided and that the president had failed to hold regular security meetings to assess the threats from the militants.
Easter Sunday bombings: Sri Lanka President Maithripala Sirisena issued an extraordinary gazette banning a number of extremist organisations on Monday. He also prohibited the use of drones in the country until further notice.