Producers behind She's Lost Control, a film about a sexual therapist who falls for one of her clients, have started a fundraising page on Kickstarter.com in a bid to generate $50,000 (£31,000) to get production rolling.
Casablancas has promised to get onboard and work with his composer pal Simon Taufique to score the film if the appeal is a success.
In a video on the Kickstarter page, Casablancas says, "I'm Julian, I'm one of Simon's friends. Whatever he needs, I'll do."
More than 110 backers have already contributed $11,733 (£7,333) towards the target amount.