I'm trying to get a prop_physics_multiplayer to hit the player/s instead of just passing through them. This will be used to detonate a futbol on player contact. I tried making the Physics Mode "Solid" but it didnt work.

If theres just not a way to do this with the futbol model, I'd settle for having any physics model blow up on contact with a surface AND the player.

Parent a solid block to the model so they hit it?

if you just want it to explode on contact then try parenting a trigger_multiple to the prop_physics_multiplayer and make it so it triggers the explode input (if it has one that is... otherwise I have no idea)