Josh is based on an action movie where Shah Rukh Khan and Sharad Kapoor are the leaders of the two rival gangs. Aishwarya Rai is Shah Rukh Khan's twin sister. Shah Rukh is in love with Priya Gill. Chandrachur Singh is Sharad Kapoor's younger brother who studies in a catering college in Bombay. He comes to Goa to visit his brother and plans to go back and start a restaurant there. He sees Aishwarya and falls in love with her.
Chandrachur gives up the idea of going back to Bombay and opens a bakery in Goa. When Shah Rukh comes to know about the romance between Aishwarya and Chandrachur, the fight between the gang turns more violent. How the conflict is resolved is the rest of the story.