On 1 June 2022, Liyanage assumed as the 24th Commander of Sri Lanka Army.

[4] Earlier, he served as the Commandant, Sri Lanka Army Volunteer Force.

[6] Liyanage as an Officer Cadet joined the Regular Force of the Sri Lanka Army on 27 October 1986 in the Regular Intake - 26 and followed basic military training at the prestigious Sri Lanka Military Academy at Diyatalawa and subsequently at the Pakistan Military Academy at Kakul.

After successful completion of training, he was commissioned as a Second Lieutenant in the Gajaba Regiment of the Sri Lanka Army on 23 July 1987.

He has also served as director - psychological operations, director (doctrine and training) and director (operations and systems) in the Office of the Chief of Defence Staff (OCDS); adjutant - General Sir John Kotelawala Defence University, staff officer - 2 (admin) - regimental centre of the Gajaba Regiment and staff officer 2 - directorate of staff duties at the Army HQ.