She performed a famous dance number called "Dance Dance" in the 1987 film Dance Dance . People often refer to her as "Sapna from Dance Dance ."
There is no widely known, major mainstream Indian film actress named (e.g., no Bollywood, Tollywood, or Kollywood star uses that exact professional moniker). The name strongly suggests a confusion between two different figures, or a character name. Indian Actress Sapna Sexy Dance 3gp
Low probability this is what you meant. Possibility 3: You mean a Regional Actress (South Indian) Named "Sapna" There are actresses named Sapna in Kannada, Telugu, and Malayalam cinema (e.g., Sapna Raj – known for item numbers and dance songs, sometimes called "Sapna Dance" informally by fans). She performed a famous dance number called "Dance
The character Sapna in Dance Dance has no independent romantic storyline; she is part of a dance troupe. The main romantic storyline is between Mithun's character (Raja) and Sumeeta's character (Rita). Sapna's character is a friend/competitor. Low probability this is what you meant