I couldn't find any information that suggests Sathi Leelavathi is available on TamilBlasters. However, I can suggest some alternatives to access the movie:
Considered a "masterpiece" by many, the film remains a staple for fans of Tamil cinema because its humor has aged well, even as modern comedy evolves. Its commercial success at release and subsequent cult status make it a top recommendation for anyone exploring Kamal Haasan's lighter, comedic side.
Loosely inspired by the 1989 American film She-Devil , the story centers on (Ramesh Aravind), a married man who becomes unhappy with the plain looks and weight of his wife, Leelavathi (Kalpana).