Is it posible to avoid sonic boom...
A sonic boom is just a shock wave which forms when an object goes faster than the speed of sound. It is caused by the air not being able to "get out of the way" fast enough.
If there were a way to use magnets or something similar to keep the shock wave from forming, then that would mean that there was no (or little) air touching the plane.
No air touching the wings means no lift.
No lift means you end up with a rocket, not a plane. If the engines were airbreathing, they would shut down, and the plane would fall to earth.