This takes a bit of work on your part, but it's worth it.
He needs to understand what STOP means.
So you need to play games, many times a day, which include stopping. games such as musical statue, songs that have pauses (such as 'hickory dickory dock' - you whisper STOP when there is a pause in the song), when he reallly gets what it means to say 'stop' then he can ask you to stop - put some silly music on and when he says STOP you have to stop, etc etc.
Another good listening game is to make some giant ears (using an old alice hairband) and walk around in the house and outside the house, trying to get him to listen to the sounds around him. He can hear birds, airplanes, cars, people talking, etc.
Many children, especially those with hearing difficulties, are not learning how to listen and 'tune in' with what's around them. I am sure that if you look up 'listening games' on the web you will find other activities.
Another game we play (I'm a childminder) is to put a lot of small musical instruments/objects that make sounds in a bag, and you pick one of the objects (a small bell for exampe) and make the sound, your son has to guess what it is.
One thing that sometimes work is to have your 'secret code word' (we used to use 'sausages') and when you say that word, your child has to stop and freeze on the spot.
As I said, it's not instant, it takes some work, but it is very good also to prepare a child to listen and can improve their behaviour. Any game that encourages listening would be useful. Sorry about the long post.