 As of 2012 he served as working president of the Arunachal Pradesh branch of the Indian National Trade Union Congress and joint convenor of the North-East states for INTUC.Sonam served as chairman of the Arunachal Pradesh Building & Other Construction Workers Welfare Board (APB&OCWWB).He was removed from this post by the Arunachal Pradesh state government on 27 January 2014, midst protests from AAPWU and INTUC.