Can you limit how fast a car can go?

Yes, but it requires a NexIQ or similar control box which is substantially more expensive than someone who simply wanted to, say, limit how fast their teenage kid can drive, is willing to spend. Your best option would be to have this done by a shop.

What you're talking about is actually a very common practice with commercial vehicles.... most trucks are governed at a speed between 62 and 75 MPH (depending on the fleet).