It is highly probable that "Sarumathi Nee En Sonthamadi" is either an alternative title for one of these songs or another track from the same album that is not widely indexed online. Your best bet is to locate the full album "Sonthamadi Nee Enakku" on Masstamilan and listen to the tracks to identify your desired song.
(Sarumathi, you are mine – If I touch you, my hand burns). sarumathi nee en sonthamadi song download masstamilan upd