Can I become an HR manager out of college?

There is a quite a lot of technical knowledge needed and personal skills with people needed to do it even moderately well. It’s like asking could you do the job of an electrical engineer out of college (without an engineering degree or any experience).

That will depend on you having a degree in HR or not and whether some hiring manager thinks you have the knowledge and skills that their job opening for manager HR requires. Most won’t even if you have the HR degree - they will want to hear that you are taking the steps to become certified as an HR professional by the professional body in your area.

On a second level, you might run into some manager who would hire you for a job with this title, but it doesn’t mean you could actually do the job. There is a quite a lot of technical knowledge needed and personal skills with people needed to do it even moderately well. It’s like asking could you do the job of an electrical engineer out of college (without an engineering degree or any experience). If you got the job like the guy who talked his way into being an airline pilot or a doctor, you’d find you were short on actual knowledge for it and that would fairly soon become apparent to people dealing with you on specific HR problems. You’d have a lot of reading to do in a very short time to make any sort of stab at it since the problems come at you in no particular order and from every direction so any gaps in knowledge are likely to show up quite soon.