Hi Frank,
Can you explain what you mean by "moving your project"? Let me know what you are trying to achieve and I'll suggest a solution.
Here I'll explain how things work from the technical point of view. WireframeSketcher remembers shared links locally in your workspace, deep under the ".metadata" folder. The actual directory where this information is stored looks something like this:
WireframeSketcher/.metadata/.plugins/org.eclipse.core.resources/<project-name>/.indexes/
There is one or several "properties.index" files directly in this directory, or somewhere under it. These files work like a dictionary where WireframeSketcher stores the association between shared files and shared web links.
The way things are designed right now, this information was never meant to be moved from one place to another. However if you still wish to do it, then you'll need to take these files (keeping the same directory structure) to this other place that you move your projects to.