He enrolled as an Attorney-at-Law of the Supreme Court of Sri Lanka in December 1997. He holds a Bachelor's Degree in Law (LLB) from the University of Colombo, Sri Lanka and a Master of Law in International Trade (LLM) from the University of Wales, United Kingdom. He was awarded a Post Graduate Diploma in Intellectual Property Law by the Institute of Advanced Legal Studies of Sri Lanka Law College. Mr.Wickramanayke who has served on the Executive Committee of the Bar Association of Sri Lanka and currently holding the position of the Vice President of the Colombo Law Society, which is the largest branch of the Bar Association of Sri Lanka. Mr.Wickramanayke has served as a judge of Moot Competitions conducted by the University of Colombo, Sri Lanka.