The problem is even just getting punched once by Superman is going to send Thor flying quite a distance away. Also, what if J'onn just chooses to shut down his mind? He have any resistance feats? I don't think Loki had full on mind control or anything. Then we have Flashes vibration trick, which might do something, then we have the fact that Superman most assuredly will not just be hitting Thor once.
Honestly, even Flash can do exactly what he did to Superman, grab him at super speed and spin him around so fast when he lets go he sends him flying. That won't defeat Thor, but he'll be thrown a decent distance away. Or just spin him around at super speed until J'onn mind screws him.