During the span of four-decades in the legal field, she has specialised primarily in civil law, and also served as an acting judge. She has been a managing partner of an esteemed law firm since 1980. As an active participant of several associations and movements, she has authored many books and articles pertaining to advocacy for education and children's rights. Anoma notably served as the Chairperson of Sri Lanka's National Child Protection Authority from 2010 to 2015. She was co-opted into joining the International Board of Aide et Action International in October 2016.