You can . . . but the rubber boots on all the joints will collect sand & should be thouroughly cleaned after the blasting process. You'll need to curl up the boots and use a high pressure spray cleaner (Brakleen works great). I just finished a major blasting job and was able to get all the sand out without any problem. You should grease the hell out of the joints when you're finished & this should push out any sand you've missed.
Another, and probably better, option would be to use black slag for your media. It's as abrasive as sand, won't get wet & sticky in humid weather, and it's not as much of o problem if you don't do a good job on your clean-up. Happy blasting!
Lee
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1969 Custom 20 Longhorn
1970 CST 20 Fleetside
1950 Plymouth Special Deluxe
1991 Jaguar Sovereign
1992 Mazda Miata
1969 Triumph Bonneville
1964 Harley Sportster