Yes, you can do this by temporarily making the source Sandbox environment as Production environment from the Dynamics 365 Admin Center.
Once you set the Type to Production for the source environment, you can either chose to do a full copy (metadata with data) or Minimal Copy (metadata only, w/o data)...you can copy over from the temporarily made Production to the Sandbox environment you wanted to copy to.
Here's how you can edit the type of the environment -
1. Select edit on the source environment (which is currently Sandbox)

2. Switch Instance Type to Production as shown below

3. Once you save and confirm, you'll see a Copy button here (I don't have it since I have only 1 instance on my trial). You can click on that and then those what type of copy you want to do, also to which Sandbox you want to do it.

Hope this helps.
Note: If this helped you, please mark my answer as verified.