"We stand with our Sri Lankan brothers and sisters in their hour of need", he had said.
India has already sent three of its navy ships, carrying supplies and other aid, the first of which arrived in the capital Colombo on Saturday night.
Landslides and floods killed at least 91 people in Sri Lanka on Friday, the Disaster Management Centre said. "If we see more heavy rains sweep across the country, not only will it increase the humanitarian needs but it will also make accessing communities even more hard", Mr. McIvor said.
Police spokesman Priyantha Jayakody said at least five landslides had been reported in Kalutara, the worst-hit district on the west coast.
According to the Disaster Management Center (DMC) sources the total number of displaced persons due to the disaster situation has increased up to 493,455. The ship will also carry medical and diving teams, boats and helicopters and is likely to reach late morning or by noon tomorrow.
The ship was dispatched on Friday with relief items following a request made by the Sri Lankan government.
A Sri Lankan man removes belongings from his submerged house at Wehangalla village in Kalutara district, Sri Lanka, Saturday, May 27, 2017.
The Meteorology Department has predicted that rain and windy condition will continue over the South-Western part of the country due to South-Western monsoon.
The flooding this year is the worst since May 2003, when 250 people were killed and 10,000 homes destroyed after a similarly powerful monsoon. 40 people with injuries have been admitted to various hospitals in the country.
The Sri Lanka Red Cross issued a landslide alert Saturday, saying "people living on steep slopes and near risky cut-slopes should be watchful".