My toilet sits about 5feet from stack,Iwant to move it to the corner of bathroom so I can move my shower so they are beside each other with a wall dividing them ,so whaen you walk in the washroom they face the door

can I move my toilet
about 20 inches
YES! Next question. Without any details that's the only answer I can give. To tell you more I need to know.
1) What material the pipes are
2) Slab or flooring?
3) Will a permit be pulled?
4) Will you be doing the job yourself or will you contract it out.
5) If you're doing the job yourself do you have the tools and plumbing skills to accomplish this remodel?
Back to you, Tom

Yes it can be moved just find the route of the plumming and re work it so it in the place you need it to build your wall