During his time at Peradeniya, Andagama acted in stage dramas produced by Prof.
Ediriweera Sarachchandra such as
Wellavæhum,
Elova Gihin Melova Avā, and
Raththaran. After completing his degree in Anthropology, he was appointed to a first teaching post at Bandarawela Ella Maha Vidyalaya, but he refused, instead opting to work as a teacher in a
pirivena in
Pilimathalawa. Thereafter he served as the caretaker of the Anuradhapura Senapura Home of the Department of Probation and Child Care. Due to the pressure given from administrators of the probation center, he later applied for the post of Anthropologist in the Sinhala Encyclopedia published in a newspaper. Accordingly he was able to write articles for the Sinhala Encyclopedia. He searched for antiques in the barns and chimneys of the village houses, discovering traditional furniture such as old kitchen utensils, old furniture and farm implements, establishing an anthropological deposit in the National Museum. He did special research on
mammoty and
plough as there are differences between such tools from Ratnapura,
Monaragala and
Tissamaharama. Meanwhile, he organized many temporary exhibitions in the National Museum and popularized the museum among the public. After He resigned from his position at the National Museum in 1990, after serving for 20 years. Meanwhile, he became interested in
vexillology and later co-founded the Flag Society of Sri Lanka with Prof. Nimal de Silva. In the following years, Andagama also served as an external lecturer in many local universities. He helped to establish the National Museum of Traditional Agriculture at
Gannoruwa. In 1991, he was appointed as the Director Promotion of the Central Environmental Authority in which he served for 3 years. In 2010 he became the Chairman of the Arts Council of the Department of Culture and as an Advisor to the Ministry. In his late years, he was the Senior Assistant to the Sinhala Encyclopedia. ==Notes==