basement toilet/shower drain

Can I hook up a shower drain directly into a toilet drain pipe (probably 3") which drains into a sewage tank (about the same size as a sump pump tank)? The sewage tank has a pump which lifts the sewage up to the basement ceiling level and into the pipe (pvc) which goes to the septic tank system. I realize that the shower drain must have a goose-neck to stop gasses and smell from coming back up into the shower stall. I will have to cut, drill, saw, through the cement floor approx. 4 ft. from the toilet flange to the sewage tank. (This is a whole new project, ie, no existing drains, the tank is in place though) Thanks, Skyway.