You could start with these two websites...
http://www.herpvetdirectory.com/ &
www.arav.org/
Do you have a venomous mentor to work with? Hopefully you do and they can recommend someone. In the past after gaining a repore with my dog vet I had no problem with seeing a venomous snake. Fortunately I've only had to do this twice with a venomous snake in over 35 years of maintaining them.
Having the correct restraining devises such as tubes, pin stick, tongs, and squeeze box will go a long way to convince your vet that you are responsible and experienced.
Vets are recommended to follow strict protocols when dealing with venomous snakes at the clinic. This can be rather costly. A home visit may be more feasible if available.