Are you wanting to move them from the phone (they are already on it) to the SD card? Or are you wanting to take them off say a computer and put them on the card?
In either case, you can connect to a computer and move them to the card, and save copies to the computer as well. Which I would really recommend, as I see so many posts about lost images. But if you back them up often to a computer or cloud account, then you have them no matter what happens to the phone.