It depends on the type of shoe deodorizer that you are using but yes, they can be used for other parts of your body. However, this does not reign true if the spray is not designed to be applied to your feet. In this case, avoid doing this as it will probably prove to be ineffective. But, you could feasibly use a powdered solution as a skin protectant or even a deodorant. Given the ingredients are safe and natural, this should not present any issues for you.
Although, you may want to look at it this way. Skin protectants and deodorants can be purchased separately and there is only so much solution that you have. Most of the time, you should limit the amount you use elsewhere as it is not as if shoe deodorizers are cheap, to begin with.