You will probably have to take it to the dealership to take care of this. They'll have to remove the player, then open up the top of it to get the coins out I would think. Not sure of any home remedy for this, I wouldn't recommend inserting anything in there to try and get them out. As you might damage the laser lens or motors on the cd player.
If you're brave enought to fix the player with power off I'd try the following.

1) flashlight and tweezers

2) double-sided tape

WARNING, MAY SERIOUSLY RUIN YOUR PLAYER. TRY AS A LAST RESORT.

Put some double-sided tape on the bottom of a metal ruler or other thin, strong object. Stick in slot, gently, and go fishing for coins. Do not do this with the player on. And know that if you get any of this on the DVD's read head, it's going to be unhappy. I'd try putting the ruler in less than 1/2 the diameter of the DVD slot, on the assumption that the coins aren't far in and that the read head may be on the "far side" of the player, but there's no guarantee of this.