How can a Salesforce Sandbox be Veevatized in order to work as Veeva CRM?
A full Sandbox can be refreshed to match the CRM Production org as long as it has been 29 days after creation. Other Sandboxes such as Developer, Developer Pro, and Partial Copy need to be customized manually or with the help of Veeva Services. Veevatization is outside of the scope of Support.
SFDC Documentation: Sandbox Licenses and Storage by Type, Setting up a CRM Sandbox Org