In a conducting sphere, like charges repel each other - so when there is a net charge, it will all appear on the surface (they try to get as far away from each other as possible). In a non-conducting material, charge will stay wherever you put it - so if you have a solid material with a net charge per unit mass (not sure how you achieved that), it will not redistribute.
If you have a point charge inside a grounded, conducting sphere, the charge will attract equal and opposite charges onto the sphere until the net charge is zero (until that time, there is an external electric field that can pull charge towards the sphere - again, this requires the sphere to be grounded).
If I misunderstood your question please clarify...