Moving Sparse Disk Image onto Hard Drive

I created an 8 gig sparse disk image of a 15 minute video. I want to move the sparse disk image off my computer into an external hard drive. I cannot seem to be able to do this. The sparse disk image shows up as a hard drive and I cannot drag and drop it onto a folder I created for sparse disk images on my external hard drive. My goal is to store it there and be able to double click it to bring it back into Final Cut Pro X as a Drive containing my video.