Sure you do. By standing at the appropriate spot before casting the spell, then moving back to wherever*. Aiming is something ALL artillery-style casters have to deal with. Well, except the Evoker school, but everyone else has to aim.A wave of thunderous force sweeps out from you. Each creature in a 15-foot cube originating from you must make a Constitution saving throw. That is a level one spell. You don't choose it's location man. This community is hell bent on arguments, huh? And these still aren't doing any lightning damage, so how can those cool class features work? Say you take elemental adept and choose thunder, but then learn that you can't push anyone anywhere. Fine, take lightning, and wait till you get call lightning, better be outdoors or in a football stadium.
* Remember, you can move before your action as well as after it. So, you can dash into the middle of enemy forces, unleash thunderous hell, and then run back behind ally lines.