Install to Emunand. Dump your Nand to SD first. I use USB Loader GX to accomplish this. 

You need USB loader GX. Install it, go to settings, create emuNAND, "just like creating NAND through bootmii".

Than, while still in USB Loader GX, use the wad manager found in settings, to install wads from emuNAND folder. 

So basically, I've recently been installing a lot of wads on my Wii and it's gotten to the point where I can no longer install anymore due to limited storage. 

Is there anyway to install a wad on the same SD card that it's on and then be able to play it? I tried installing a wad on my Wii and transfered it to the SD card, but when I tried to play it, it only resulted in an error.

Is it possible to play WiiWare titles from the same SD card that has homebrew files?