What to do about him and trouble at school?

My son's 5 years old & in kindergarten. He's been in daycare his whole life. When he was going to daycare he was always getting in trouble for acting out, not minding, bothering & hitting other kids. Now he's in school & he's had to go to the principal's office more than once & had to sit out of recess as well as have detention. He sometimes won't pay attention during cl.(twirling around, falling out of his chair repeatedly & so forth) He also plays rough w/kids...pushing, hitting, etc & that's why he has to go to the office. Him & I talk about this ALL the time & he gets grounded, his toys taken away, etc. It doesn't seem to help. I don't understand why he won't behave so he can stay out of trouble. He's a sweet boy(i know it probably doesn't sound like it) but he is. He's happy & pretty much always stays in a good mood. He's pretty hyper though, always bouncing & running around. He's always on the move & he has a hard time minding me as well so it's not just at school.