You can do this, but you'll need to replace the 30A breaker with a 20A. You can run four wires: two hots, neutral, and ground. The 120V loads go from either hot to neutral, and the 240V receptacles (make sure to use a 240V receptacle type!) go between the two hots. I installed a few circuits like this in my old shop (not re-using an old circuit, though). The way I arranged it, I installed double gang boxes. Each box had one duplex receptacle, and one 240V 20A receptacle. The duplex was split so the top half was on one hot and the bottom was on the other. That way I could run two high-current 120V tools from the same outlet.