Sephton, 29, leaves Matlock without playing a game for the Gladiators, having joined them from Warrington Town shortly before lockdown.
Manager Simon Haworth said: “I’m over the moon to sign Scott. He’s a player, i’ve admired for a long time.
“I’ve tried signing him three or four times, both at Stalybridge and at Clitheroe. It’s been a long time coming.
“I’ve always believed Scott will play his best football under myself, I know what kind of lad he is and I think he’ll thrive at our club. Most importantly, he was desperate to come and play for this football club, like everybody else we have signed.
“Playing for myself and the staff and playing for this club has been the priority for all the players we have signed, we have had no players sign for us this year and had debates about money, they’ve all signed for the right reasons.”
Stalybridge have also signed midfielder Damani Holness from Stockport Town.
Holness, 24, has had spells with Morecambe, Stockport County, Northwich Victoria and Macclesfield Town, before a spell in America with Memphis 901 FC.
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