Talking to MTV News, he revealed: "I think it's a good idea. The only bit that I could get away with doing is after the last one I made, Episode III, before Alec Guinness, there's that period where he's in the desert."
The actor then speculated that the story would revolve around Obi-Wan's survival on Tattooine: "That might be my window, there, to tell that story. I don't know what he did in the desert."
"We could make up some stuff," he suggested. "Could be quite exciting. I'd be up for it, for sure, of course!"
Disney confirmed earlier this month that there are two standalone spin-off projects in the pipeline.
The Empire Strikes Back and Return Of The Jedi screenwriter Lawrence Kasdan, who is currently working on the projects, told the LA Times that he wants his film to "start fresh."
In other Star Wars news, Star Trek legend William Shatner told Movie Fanatic that Star Trek Into Darkness director JJ Abrams was a “pig” and should be concentrating on that movie rather than getting involved in the Star Wars franchise.
He explained: "He's collecting the two franchises and holding them close to his vest.
"He's probably the most talented director of that ilk that we have, but he's gone too far this time."
He also then went on to say that the pair were friends and that he would "put him straight".
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