The hospital replaced the Apollo brand name and logo with new ones in the move which came in the wake of the hospital coming under state control following a court order.
Lanka Hospitals chairman Gotabhaya Rajapaksa, who is also the head of the island's defence establishment, said some of the hospitals beds would be reserved for the military.
"In time to come we want to dedicate a certain amount of beds to soldiers," he told a news conference.
The government has improved welfare facilities for soldiers in the run up to and following the end of the 30-year ethnic war.
Sri Lanka has a shortage of hospitals with both government and private hospitals heavily over-crowded.
Government forces defeated the Tamil Tigers in May after a campaign in which Rajapaksa played a key role as defence ministry