Two years later, I know, but this same question occurred to me "can a Soulbow dual wield mind arrows?".
After reading threads like this one, and going over the rules, the answer is, yes.
Exact wording of rules for TWF:
"If you wield a second WEAPON (key term here) in your off-hand, you can get one extra attack per round with that weapon."
Well, unless I am mistaken, a mind arrow is a one handed WEAPON, and thus, you can dual wield them.
I have even read rules on crossbows that explicitly state that you can fire one in each hand, but take the normal TWF penalties, so it stands to reason that you can do the same with mind arrows.