It was announced in November that Warner Bros is developing a feature film based on the series, without creator Joss Whedon.
Head told The Huffington Post: "It's a horrible idea in as much as Buffy was a great conceit. It was a great story. A great idea. I don't feel that you can then remake that without the original creator on board. It doesn't make sense."
He argued that the new adaptation was inspired only by a desire to "make money".
"Somewhere down the line, I suppose... you could [do a remake] but it never sits very comfortably," he said. "With someone like Joss, why would you want to?"
Head's former Buffy co-stars Nicholas Brendon and Eliza Dushku have also criticised the decision to remake the show, while Whedon himself has admitted that he has "mixed emotions" about the project.