Similar to the bobby pin trick, if you have a crochet hook that will fit through the fabric, insert it next to the snag from the inside of the sweater and then grab the loose thread with the hook and pull it through. Tie it off with a knot if there is excess thread (via The Spruce).
For sweaters with a tighter weave where you couldn't get a bobby pin or crochet hook through the fabric, grab a needle and thread in a matching color, and knot your thread to the loose thread. Then push the needle through to the inside near the base of the snag and pull your thread and the snagged thread into the inside of the garment. You can knot it there or just snip off above the knot between your thread and the snagged thread (from Thrifty Frugal Mom).
One thing to help potentially prevent snags is to not wear sharp-edged jewelry (think long earrings, big rings) when you're also wearing loosely woven knits (via Martha Stewart). Another tip if you've noticed snags on your clothing after you've washed it is to use mesh bags in the washing machine or to turn the clothing inside out (via Sudsy Water).
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