Both your HDD and the SSD are installed in the same PC, yes?
And you would plan to use the SSD in the same PC after you clone the contents of your HDD, your former boot drive, yes?
If your answers are "Yes" then there should be no problem in cloning the contents of your bootable HDD to the SSD. The SSD will serve as your new boot drive and I assume you're going to utilize the HDD as a storage/backup drive, right?
After the cloning operation has completed ensure that your SSD is connected to the first SATA connector in your system. That connector will be designated either SATA 0 or SATA 1. The HDD should be connected to any of the following SATA connectors.
BTW, I've never used the SanDisk disk-cloning tool and I'm assuming it's reliable and will do the job. And I further assume that you're perfectly satisfied with the Win 7 OS currently installed on your HDD in that the drive boots & functions without any problems, right?