Today, using indeed and linkedin seem to be the norm. My son goes to a big state school and I was surprised at the lack of on campus recruiting. But he had interviews with companies that would never recruit there.
You can also find business like opportunities at non-profits, at service businesses (think hotels, car dealerships) or worst case, ask a favorite professor if you can conduct research with and for them.
Many jobs today are filled through hirevue - meaning you take a video interview and frankly, it’s a #s game in many ways.
You didn’t say what type of business - there’s a big difference between supply chain and accounting, for example.