Sri Sowmiya Narayanar Temple is a Lord Vishnu temple in Thirukoshtiyur in Sivaganga district of Tamil Nadu. The temple is one of the 108 divya desam and is the 95 in the series.
The Lord Vishnu here was worshipped by Periyalwar, Thirumangai Alwar, Thirumazhisai Alwar, Boothathalwar and Peryazhwar.
The temple houses Ashatanga Vimanam. Sri Ramanaujar has given a discourse above the temple gopuram about thirumandiram of Om Namo Narayana.
The temple covers an area of 2 acres and has huge granite walls. There two life size images of Narashimha, the avatar of Vishnu. One of them is shown holding the demon Hiranyakshipu and other slaying him.

108 Divya Desam
This temple is one of the important Divya Desam in this earth known as Bhuloka Vaikuntam- abode of Vishnu on earth. Various Alwars have composed poems on Lord Vishnu – 6500 years back according to legends. Their composition of poems on Lord Vishnu temples all over India is known as Divya Prabandham which was compiled in 9th century.