Sri Sangarayaneswar Temple is a Lord Shiva temple in Thalachangadu in Nagapattinam district of Tamil Nadu. It is one of the padal petra sthalam and Lord Shiva here was worshipped by Thirugnasambandar.
The temple and the town gets its name because of Sangu flowers which blooms here in plenty. The Lord Shiva here is also a swayambu moorthy.

Padal Petra Sthalam
This is one of the 276 temples mentioned in Devaram which are collections of songs of these temples by Thirunavukkarasar, Thirugnasambandar, Sundarar and Manickavasagar. These collection of songs composed by the great saints describe many of these temples, deities, history, legends, sthala vruksha, temple ponds and other details about the god and temple.