The 24-year-old left Imber Court in June to sign for Isthmian League Premier Division neighbours Carshalton Athletic.
He played the first six games of the season for the Robins but then recently lost his place to former Corinthian-Casuals stalwart Danny Bracken.
Beach had originally joined the Met in the summer of 2021 from then-Southern Premier Division South rivals Farnborough.
He had joined Boro in November 2018 from neighbours Fleet Town.
Previously with Hampton & Richmond Borough and Walton & Hersham, he had impressed by making 53 appearances for Fleet in 2017/18 and he played 28 times for Boro after arriving.
The Met have also signed young forward Alex Body.
Body came through Isthmian Premier League side Kingstonian’s youth ranks and has been more recently turning out for Cherry Red Records Combined Counties League side Cobham.
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