Think the negative side of snacking
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Before eating snacks, ask yourself if you need to eat it right now. Is the snack has a lot of calories? sugars? how long do you have to workout for to burn all the calories?
Brushing teeth or mouthwash
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We brush teeth or use mouthwash after eating, so brushing teeth and using mouthwash can make you feel that you have already eaten something. Also, once you get the minty flavor in your mouth you don't feel like ruining it by eating snacks.
Distract yourself
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If you have cravings for something, you can distract that by keeping yourself busy, like going for a walk, running errands and so on.