Well, you can. It's called informational interviewing. Unlike real interviews, you can initiate an informational interview and, chances are, you'll be granted one, if you approach the situation professionally. Then, treat it like a real interview and prepare for it exactly like you would for a real interview. Informational interviewing enables you to shift the balance of power and control your own destiny. If you prepare well and make a great impression, there's a good possibility you'll be called in for a real interview at some point in the future.
Informational interviewing also enables you to do two things that an online application cannot: get in front of the hiring manager and get inside the company. Then, when you do get the real interview, you'll be much less nervous, having experienced the situation once before.
I've done several informational interviews with people who want to break into the career counseling field. During our conversation, I inevitably ask them interview-type questions such as, "Why do you want to be a career counselor?" or "Tell me a bit about your background." If I'm impressed with the person, I make a mental note to reach out to that person in the event I have a position to fill. I can guarantee that the same thing will happen to you.