Hey there, there are 2 things you can do:
1. Anti perspiratant body spray by Garnier and other such brands alter your skin temporarily to block sweat glands for upto 24 hours. Just that this wont help your face!
2. Have bath with germ protection soaps, so that even if you still sweat a little, at least there will be no bad body odour.
Next Steps
If none of this helped, a dermatologist will be able to help you with medications
Health Tips
You'll sweat more if you didn't have water in a long time and then suddenly drink a lot of water and go out in the hot sun. So, continuously stay hydrated.