Things You'll Need
Instructions
Find an emulator capable of running on a PlayStation 2. The only real option for the PS2 is SNES-Station, a version of the popular Snes9x emulator made for the PS2.
Gather one or a few SNES ROMs to play the games on the emulator. ROM stands for Read-Only Memory and they are transferable files you can use on emulators. Most SNES ROMs come in a ".smc" format. Store them by using a cartridge flasher, a device that you can plug game cartridges into and that allow you to flash them to a computer in ROM format. Save them anywhere on a computer to make ROMs of any cartridges you may own.
If you don't have a cartridge flasher or SNES games, you will need to download the ROMs. Note that downloading SNES ROMs of copyrighted games is illegal, whether you own the original game or not.
Transfer the emulator and ROM files to your PS2 using any method you prefer. Refer to the emulator's instructions. You can only transfer files and use emulators on a modded PS2. A modded, or modified, PS2 is one where the hardware or software has been altered to allow you to take advantage of the hardware other than the way the manufacturer originally intended.
To mod a PS2, you can send it in to some websites at your own risk, hire a professional or try to do it yourself using manuals available online. You can also purchase premodded systems from websites or game vendors, but any modded system voids the manufacturer's warranty.
Set up the emulator by mapping the SNES buttons to your PS2 and change any video and audio settings to your preference. Most emulators allow this by using a graphical user interface, or GUI, to change settings.
Locate the ROM file on your PS2 using your emulator and run it. Your PS2 files should be organized similar to a computer, where you can look at folders on various drives. It is easiest to make a folder labled "roms" or "games" and put them in the root of your emulator folder for easy access.
If everything is in order and you have a good ROM copy of the SNES game you are running, you should have no problem playing the game with little to no change to original gameplay.