Radnor has starred for 160 episodes on CBS sitcom How I Met Your Mother as Ted Mosby, but is now branching out by writing, directing and acting in the new Elizabeth Olsen film Liberal Arts.
In an interview with The Huffington Post, the actor said film projects are a nice change from his sitcom work.
"The regularity of the show is rare to have as an actor… It's certainly as good and pleasant of a day job as you could hope to have," Radnor explained.
He went on to say: "Now that I'm doing this other stuff, however, it feels like the show and the other creative things in my life are more in balance."
Liberal Arts centres on the unlikely romance between a 19-year-old college student (Olsen) and her 35-year-old friend (Radnor).
Radnor stressed that he doesn't agree with reviewers that have described the comedy as an "earnest" film.
"I think the word 'earnest' kind of has a negative connotation on some level. I think one of the things that's happened is that being cynical is somehow conflated with being sophisticated," he declared. "I think that's problematic, to say the least. I don't think evil people or negative people are inherently interesting all the time."
He continued: "People who are good people getting better at being themselves - to me, that's something that's really interesting to watch. I went to college with really good people and had really excellent teachers and met some fascinating folks and I think those people are worthy of our attention.
"They're going through something. As they say, 'Everyone's fighting a great battle'. I think just attacking something with great sincerity feels kind of brave in this day and age, but I feel like that's what I want to do."
Liberal Arts - which also stars Richard Jenkins and Allison Janney - is now playing in the US and opens in the UK on October 5.
Radnor admitted last week that he is not sure if How I Met Your Mother will end after the current season.