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We simulate a two dimensional pinned flexible polymer in a disorder potential consisting of hard disks. While the polymer is off-lattice, the hard disks are distributed randomly on a square lattice. We are thus able to control the arising structures such as cavities and channels. In order to apply the multicanonical algorithm, we model the hard disks as finite potential wells with amplitude $k$, such that the polymer gains energy when it enters the disorder domains. Later we can reweight in the disorder amplitude, reproducing the free polymer ($k=0$) and the hard disk ($k$ large) limits. For high disorder densities the configurations of the polymer are strongly influenced by the potential, whereas for low densities the polymer is only marginally effected by the potential.