Thushara made his first-class debut in 1998–99. After a spell in Sri Lanka's premier fast-bowling academy, he impressed the selectors, and was included in the Test squad for the tour against South Africa. He did not play in that series but then made his Test debut in 2003 in the touring party to West Indies. But he did not succeed much in that series as he did not score much and did not pick up any wicket and was dumped by the wayside.
But with the grand playing style he performed in 2006/2007 First Class series in "Kandurata Team" which was held in Sri Lanka between its provinces, he was finally chosen to play against West Indies on their 2008 tour. This time, he snapped up five wickets on his return to international cricket, and then managed three in the next match, to end the series with eight. On the same tour, he finally managed to make his ODI debut as well, in an inconsequential third ODI, and was pretty impressive in his near six over spell, with analysis of 5.2–1–12–1, before it rained and the match was abandoned. With Chaminda Vaas needing the much desired rest sometimes, Mirando could have a role in the future in Sri Lankan cricket.He will also be playing for the Chennai Super Kings in the Indian Premier League after being bought for $140000 at the IPL Auction on 6 February 2009.