Sarawanabavanandan Shanmuganathan (16 May 1960 – 15 July 1998; known as Vasanthan) was a Sri Lankan Tamil militant, politician and Member of Parliament. Shanmuganathan was born on 16 May 1960. He was a Hindu. He was a senior member of the militant People's Liberation Organisation of Tamil Eelam, serving as its commander in Vavuniya. Shanmuganathan was member of Vavuniya Urban Council. He contested the 1994 parliamentary election as one of the Democratic People's Liberation Front's candidates in Vanni District and was elected to Parliament.