Asanka is a legal practitioner who was admitted to practice in 2009. Asanka practices as a Barrister at Francis Burt Chambers and specializes in all aspects of personal injury law. Asanka is also Secretary of the WA Bar Association (Inc) and serves on its Diversity Sub-Committee. Asanka is a member of the Law Society of Western Australia and sits on its Personal Injury & Workers' Compensation sub-committee.
Asanka has been a sessional lecturer in Occupational Health and Safety (Industrial Relations) at Curtin University. Asanka has been a past WAAC volunteer and has served on its Board since September 2013 in the capacities of Community Representative, Secretary and Vice Chairperson.