The stand-up told Metro that he also hopes to release an album of non-comedy songs.
Minchin said: "I want to expand and write songs for film. I've got a deal with an animation company to write songs for a film and maybe do another musical.
"I'd like to put out an album of non-comic songs. I'm sure it won't be as popular, but writing those songs is still a big part of my life."
He added: "I got such a thrill out of contributing to Matilda. It's not my story or script but it can be tedious to be in one's own head all the time.
"I'd like to write a musical from the ground up, but I'm happy taking jobs. I want to perform for the rest of my life, but I don't want to be out touring at 80, John Cleese-style because I've run out of money."
Minchin has written the score and lyrics for Dennis Kelly's musical adaptation of Roald Dahl's Matilda, which is currently showing in the West End.
Watch Tim Minchin talk to Digital Spy about Matilda and more below:
> Tim Minchin on Ricky Gervais: 'We use offence differently'
Watch the RSC trailer for Matilda below: