Having worked in the Sri Lankan telecommunication sector as a project manager at Sri Lanka Telecom and Hutchison Lanka from 2001 to 2005, Abeyagoonasekera joined the government sector in 2005 and was appointed chairman of the Ceylon Fishery Harbours Corporation (CFHC) following the Asian tsunami in 2004 which destroyed many fishery harbours. He held the post until 2010 after successful reconstruction of the fishery harbours and transforming the loss making cooperation into profit, He was appointed chairman of the Sri Lanka Foreign Employment Agency in 2010 and served until 2011, when he was appointed as executive director of the Lakshman Kadirgamar Institute for International Relations and Strategic Studies the Government foreign policy think tank under Ministry of External Affairs. Abeyagoonasekera was also on the board of directors of the Sri Lanka Ports Authority from 2005 to 2010. On 10 April 2015, he was appointed as a board director at the Insurance Board of Sri Lanka (IBSL) by Minister of Finance Ravi Karunanayake. Asanga served as a consultant to minister of finance until May 2016.