Don't think so. There is no random variable. The modifier is set by your caster level. If the modifier was 1d6+caster level, then yes you could maximize it to make it 6+caster level.
SRD:
All variable, numeric effects of a spell modified by this feat are maximized. Saving throws and opposed rolls are not affected, nor are spells without random variables. A maximized spell uses up a spell slot three levels higher than the spell’s actual level.
Edit: My bad. You probably mean maximizing the d20 roll! Hmmm, don't see why not. That turns dispel magic (automatic 30 for 10th-lvl caster) into a whole lotta nastiness! Ouch! But does it maximize the opponent's roll as well???