If you already have the movie file and just need the SRT (subtitle) file, follow these steps:
You can find English subtitles for "Vinnaithaandi Varuvaayaa" on several reputable community-sourced databases. Look for files specifically for the Tamil version, as there is also a Telugu remake ( Ye Maaya Chesave OpenSubtitles vinnaithandi varuvaya english subtitles download upd