Deleting a sandbox permanently removes the sandbox organization and all of its contents. A sandbox can only be deleted after its refresh interval has passed. If the delete option is not visible, you must wait until the refresh interval has elapsed.
Sandbox type refresh intervals:
Notes:
Use one of the two methods below to delete your Salesforce sandbox. Before proceeding, confirm the refresh interval for your sandbox type has passed (see sandbox type intervals in the Description above).
If you do not have your refresh set to automatically activate the new sandbox, you can activate it manually. Activating a refreshed sandbox deletes the old sandbox and replaces it with the newly refreshed one.
Note: When you click Activate, your old sandbox is deleted and replaced by your new sandbox. Review Activate Your Refreshed Sandbox for more details.
Find Which User Deleted a Sandbox
Refresh Your Sandbox — Salesforce Help
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