Do a search on the site for "Westside For Skinny Bastards" by Joe Defranco. He gives you exactly that.(article no.2 is even better, by the way)
Personally, I do sprints once or twice a week, max. I do them either after my heavy leg day(in this case - I work more on technique and go longer distance - 400 and 800 meters)or when I do a lighter day for legs(note : I only train legs in the gym once a week "directly", so that counts as "leg day"), I go shorter distance(60-200 meters)or I run hills.
This is together with bodyweight drills and such.
If I do them a second they, they're usually combined with strongman training, such as the farmer's you described, tire flipping, car pushing, etc. More for fun than anything.
Just remember, the stronger and faster you get, the more taxing sprints are on your body.
For some less strenuous activity which is similar, try sled dragging or rope jumping.