Hm. Probably not.
If it was possible, you'd only have to be a soulknife with the Improved Unarmed Strike feat. It's not necessary to be a monk - you only need the feat to fulfill the class prereqs and also to get the unarmed strike.
So I think you're not supposed to get both.
What's more, it's an either/or ability (unarmed strike/mind blade improvement), not two separate abilities.