The 22-year-old Coyne takes over from QPR's Tony Roberts as the deputy to Neville Southall for the European Championship Group Seven qualifier against Berti Vogts' side on 11 October.
Gould has also recalled Sheffield United's Glyn Hodges - who played under him at Wimbledon - and the Ipswich midfielder Geraint Williams in a squad showing five changes from the one originally selected for the 1-0 win over Moldova three weeks ago that ended a 12-month run without victory.
Ryan Giggs, who has played in just two of Wales' eight qualifiers so far, is named in a Gould squad for the first time after proving his fitness for Manchester United, while Sunderland's Andrew Melville takes the place of the suspended Crystal Palace defender, Chris Coleman.
Dean Saunders, who scored in the 1-1 draw in Dusseldorf in April and is now playing under Graeme Souness at the Turkish side Galatasaray, and Sheffield United's Nathan Blake, both of whom were forced to withdraw from the Moldova game, are also in Gould's party.
WALES SQUAD (for the European Championship qualifying Group Seven match against Germany at the National Stadium, Cardiff, 11 October): Southall (Everton), Coyne (Tranmere), A Williams (Reading), Symons (Man City), Melville (Sunderland), Jenkins (Swansea), Bowen (Norwich), Phillips (Nottm Forest), Horne (Everton), Pembridge (Sheff Wed), Speed (Leeds), Hughes (Chelsea), Rush (Liverpool), Saunders (Galatasaray), Blake (Sheff Utd), Giggs (Man Utd), Hodges (Sheff Utd), G Williams (Ipswich).
Wales Under-21 squad, Sporting Digest, page 29Reuse content