Or Asterform it.
In L. Neil Smith's book "The Venus Belt," there is a thriving civilization in the asteroid belt. To get more living room, they bust Venus up into planetoids.
Haven't done the math, but I suspect that even if you hit the planet with something powerful enough to tear it into tiny chunks, pulling the pieces of Venus far enough apart so they wouldn't just collapse back into a spherical mass of chunks would not be easy.