We show that the superconducting islands formed in strongly disordered superconductors are susceptible to exhibit shell-like effect, analogous to the same observed in superconducting nanoparticles. The shape and position of the islands appreciably change if the average electron density, $View original: http://arxiv.org/abs/1307.0609
$, is tuned without changing the disorder landscape. Upon monotonic sweeping of $ $, the spatial structure of the pair-amplitude passes through entirely different looking textures, sometime even noticeably less inhomogeneous structure. Both the spatially averaged pair-amplitude (SAPA) and quasiparticle excitation gap oscillates with $ $. The correlation of SAPA with the mean level spacing of the low-lying quasiparticle eigenstates is explored. The experimental consequences are also discussed.