"Thanks to my fans and the World Soundtrack Academy for the Public Choice award for the score of '127 Hours', " Rahman posted on his Facebook page.
The World Soundtrack Academy Saturday announced the 2011 winners at the closing of the 38th Ghent International Film Festival.
The two-time Oscar winner was competing in the best original song written directly for the same track category, but lost out to Randy Newman, who took home the trophy for "We belong together" from "Toy Story 3".
"127 Hours", directed by Danny Boyle, was based on mountaineer Aron Ralston real life story how he chopped his hand to save himself after a boulder crashes on his arm and traps him in an isolated canyon in Utah.