There are no apps to do that. Your issue is that your wifi signal isn't reaching your outside location. You will need to either move your wifi router closer to your outside location, or install a wifi repeater (it re-transmits the wifi signal ot extend it's range). You could also try raising your router up higher where it's at. Sometimes that helps.
I have my wifi router in my front room and can use my SGP5 in the backyard...about 30 or 40 feet away. I don't get a real strong signal, but it's enough to work. Remember, your router is just a radio transmitter/receiver. Stuff like walls, appliances, etc., can interfere with its signal. The more "line of sight" it is to your SGP, or laptop, the better it will work.