dear Shruti,
I can give you a few suggestions:
you can try to:
1. put weights (half kilo for example) around his ankles, it is possible this will make him more aware of his feet and where he is putting them
2. try making cardboard or plastic clownsfeet, big feet that fit over his shoes, then show him how he can walk as charley chaplin... making them for yourself as well and doing this with music on will be great fun
3. you can also make big broader shoes, forcing him to abduct
4. Try placing feet on the ground he has to step on, if he finds this boring, make something he likes to stand on.
(I often draw them on paper, kids love the sound of walking on paper)
I hope one of these suggestions does some good.
Esther