SSH into a RPI that has no internet connection?

I am going to be building a robot soon with my pi. This would be done often on school grounds, this would mean i would often use eduroam. But because of this, even if i manage to connect RPI to eduroam, there is no way(easy or moderately difficult) i can SSH into it.

This got me thinking, that if i could make the pi send out its own signal as wifi, could i some SSH into it as a local network??? Would i need to create 2 networks?

Is there any possibility of this?