Sankaranainarkoil alias Sankarankoil (Arulmigu Sankaranarayanaswamy Temple), situated 56 km from Thirunelveli on the Madurai-Kollam rail route is dedicated to Lord Sankaranarayana, a combination of Shiva and Vishnu. The idol in this temple is believed to be the embodiment of earth. Besides the main shrine, there are two other shrines dedicated to Lord Sankaralinga (Siva) and Goddess Gomathi Amman (Parvathi). The temple famous for curing illness was built in the 11th century by the then ruler Ugra Pandyan and was later expanded. The gopuram (tower) of the temple is a nine storeyed structure measuring a height of 38meters.

Devotees believes that the sacred tank in the temple named Nagasunai have been dug by serpent kings named Paduman and Sangam and has a miraculous power to heal all the diseases. Adi thapasu festival is the main temple festival held on Uthirada day in the month of Adi (June-July).