The song you are looking for is actually titled "Saarumathi" (or "Sarumathi Neethan Sonthamadi") from the 1997 Tamil film Saathi Sanam
Quick Tip: If you're looking for the lyrics to sing along, they are available on platforms like Smule. sarumathi nee en sonthamadi mp3 song masstamilan install
: You can find the high-definition (1080p) video song with Dolby Digital audio on Gaana/Boomplay The song you are looking for is actually
For Android users (install process):