Can you use PowerCLI on your workflow ?
If you can use PowerCLI, you can use this Script :
$MydataFolder = get-folder -Type Datastore -Name Folder
$Datastore = Get-Datastore -Name datastoreName
Move-Datastore $Datastore -Destination $MydataFolder
I don't know if there's a canned workflow, but you can create your own.
Create an array with the datastore(s) you want to move.
Get the object for the folder you want to move them to.
Then do folder.moveIntoFolder_Task(arrayOfDatastores);