Written by Christopher Kyle and Kevin J Walsh, the movie tells the story of a man who is transported to a parallel universe and how he tries to convince the love of his life - who does not recognize him - that they are soulmates, said The Hollywood Reporter.
The project is currently in casting process with Gotham Chopra and Carla Hacken producing it.
In the past, Radnor, 41, has written and directed two movies, "Happythankyoumoreplease" in 2010 and "Liberal Arts" in 2012. Unlike these films, he is not expected to act in "The Leaves".