Yes there is. It's called a PVC snap tee and it's made for precisely this kind of application. It's like a regular T, except the back half of the long part of the T is missing and it's sized to snap over the existing PVC pipe. You glue it in place, then use a drill inside the short open end to make a hole into the existing pipe. No fuss, no muss.
Most hardware stores have what is called a slip fix telescoping connector. It slips over the end of your pipe on wide end (use primer and glue) then uses either a coupling or slip T on the other. The slip fix uses "O" rings to seal so it can telescope out. Just do not use on the main line that has constant pressure they are designed for intermittent pressure only.
The post is over a year old, but all he needs is a snap on tee. No cutting, no mending.
Or just dig out a couple of feet along the pipe, lift up, cut out enough to accomodate a regular tee, attach tee to ends, push all down.
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