Jeremy suggestion is very good.

If you play both hands at exactly the same volume, the right hand will naturally come out because the high register is heard more distinctly. The usual problem is not to make the right hand sound louder, but to make the left hand sound louder.
If you can practise in a digital piano with split voices, make the voice for the right hand a subdued instrument (like wood bass, for instance) and the left hand a bright instrument. This way you reverse the situation above and in order to hear the right hand you will need to really accent it.
Finally, get a pair of surgical gloves and cut the finger ends (so you have touch unimpaired). Now play wearing a glove on the
right hand After a few minutes of practise, take the glove off and you will see that the right hand (the one with the glove) is now more accented.
Best wishes,
Bernhard.