I didn't say he was "fat", maybe he is just big boned...lol. Snakes can be over weight though. I have seen a number of burmese and reticulated pythons that are overweight, and occasionally see Boa constrictors that are over weight. I cannot say that I have seen sand boas that are "overweight" per se but it can happen.
As far as other sexing opinions go... You could probe him and/or attempt to "pop" him. Both of those techniques (especially the probing) should be done by a person with experience.
If "he" has babies..... problem solved.
-Chris
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Christopher E. Smith
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Captive Bred Herps
Wildlife Research & Consulting Services, LLC


