Gunasekara was educated at Royal College in Colombo where he was captain of the cricket team and achieved colours in both athletics and football.
He moved to England in order to study medicine at Cambridge University and excelled again at sports, only missing out on a Blue due to the outbreak of the War.
[1] In 1919 he made his first-class debut for Middlesex and went on to have a good all-round Championship season, with 36 wickets at 27.72 and 351 runs at 21.93.
He captained Ceylon's first overseas touring team, to India in 1932–33, but was called back to Ceylon during the tour in his capacity as Chief Medical Officer of Health, Colombo Municipality, in order to deal with a smallpox outbreak, and was absent during the two matches against India, when Ed Kelaart captained the team in his absence.
[5] He played 10 first-class matches in total for various Ceylonese representative sides and also captained one in a non-first-class fixture against Don Bradman's Australians.