Yes. You can give it to him, have him do the test then mail it back, or give it back to you...whatever.
Three things:
1) Be sure he signs the release or it will be useless.
2) Put his name on the kit, not yours. You can put two email addresses on the account so you can both get the emails from ftdna, or if he is not interested, just put yours.
3) Be sure to have a discussion with him concerning "Beneficiary" and what you can do in the event that he dies, ie. add more markers, or snps. A simple email granting permission should be adequate. Also, get permission to share on wikitree.
Hope this helps,
Dawn