A mod chip? While it is possible, it is highly unlikely.
Twenty pin mods (which is what you'd need) have been out of production for several years now. Occasionally they do pop up for sale, but you'll be paying quite a premium for one if you can actually find one.
Assuming you have a Euro Saturn, a 50/60Hz switch will allow you top play non-PAL optimized games at the same speed as you would on a US/Japanese console.