Hi David Hilt,
Are you working with Server? online? Public?
You might need to check this Knowledgebase article
Lénaïc RIÉDINGER, Global Community Engineer Tableau
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I would think that the following should work.
1. Create Sandbox Project
2. Create Group, and add all user accounts (who are to access project) to this group.
3. Ensure that all users have the publisher role.
4. Remove 'All Users' Permissions from Project
5. Add Group to Project, and set the following Permissions
Project View: Allow
Project Save: Allow
View Workbook: Deny
This should allow them to publish workbooks to the project, which only they (and any admin) can access.
Hope this helps