Per Major League Soccer and club policy, terms were not disclosed.
A native of New Jersey, Meredith, 22, was a three-year starter at Monmouth University. He trained with Seattle throughout the 2011 preseason and started in net for the nearby USL Premier Development League champions Kitsap Pumas. Meredith started Kitsap's 2-1 loss to Sounders FC in the U.S. Open Cup third round on June 28.
"We are excited to add Bryan Meredith to our roster," said Sounders FC technical director Chris Henderson. "He will join Kasey Keller and Josh Ford in the nets for us. Bryan had a solid season this year in the USL and had some fantastic games. We expect he will continue to progress under goalkeeper coach Tom Dutra."
Meredith was named to the 2010 All-Northeast Conference first team and NEC Tournament MVP as a senior at Monmouth. As a junior, Meredith led the nation in goals against average (0.306) and also led all NEC keepers with 12 shutouts