The showrunner told fans at the Edinburgh International Television Festival that a cinematic spinoff from the BBC sci-fi drama is possible, but insisted that the television version is his current priority.
"I'm sure that we should do [a movie]," he said. "The one thing that I always keep saying... is it can't ever be allowed to interfere in any way with the television show - that is the mother-ship."
Moffat added that a Doctor Who film would be "unbelievably exciting", providing it did not affect production of its parent series.
"The absolute most important thing about Doctor Who will always be the TV show," he said. "It would be great to see the TARDIS on the big screen... but not [if it gets] in the way of the show."
Last month, Moffat dismissed reports linking Harry Potter director David Yates to a Who film reboot as "some weird fantasy".
"I can assure you definitively that was all nonsense," he said. "Not the idea of making a film, we'd love to make a film, but the idea of a rebooted continuity, a different Doctor."
Doctor Who will return to BBC One and BBC America on Saturday, September 1.