Easily, actually. The Spirit Bomb draws its strength from the server average, and is static. So there are a few ways.
1.) If you are way above the server's average power level. I was once at several million and was so much stronger than the rest of the server (mostly people at base PLs) that I could bat Spirit Bombs away.
2.) If you have enough power, and enough space between you and the bomb, even a generic beam could push it--theoretically. This is true of all projectiles, Spirit Bomb included, because they cannot have added power put into them after they've been fired like a beam can.