Of course an omnipotent being could seal his own power away.
Through choice of not using his power.
Say he rewrites the laws of the universe to make Bardock's question possible in the slightest, since the Earth itself is composed of smaller things. Simply using the universe s is he could create an object that would bind itself to either the dirt of the ground or the water of the sea. lift it up and it would not seperate.
He could then limit himself so that an attempt made to seperate even by himself would fail.
Then part of the paradox would be solved. then simply turning it off he'd beable to seperate it and the second part would be solved.
There's nothing in the question that states he couldn't try again later. and if you did then you would be asking if an omnipotent being could end its own omnipotence.