Wales bounced back from their opening World Rugby U20 Championship loss to New Zealand with a comfortable 31-10 bonus-point win over Spain.
Woodman, Harry Rees-Weldon, Harri Ford, Nick Thomas and Owen Conquer from Dragons RFC started the game with prop Jordan Morris a second half replacement.
Richard Whiffin's side led 24-10 at half-time at the Athlone Sports Stadium in Cape Town thanks to converted tries from Ioan Emanuel, Elijah Evans and Kodi Stone, with Pablo Guirao crossing for Spain. Replacement scrum-half Ieuan Davies added a fourth Welsh try soon after the restart to secure the bonus point.
That sets up Wales for a crunch last Pool A encounter with France on Tuesday (July 9), who beat Spain 49-12 in their opener - with the game also taking place in Cape Town. France play New Zealand later on Thursday.
Wales U20s: Matty Young (Cardiff); Harry Rees-Weldon (Dragons), lijah Evans (Cardiff), Steff Emanuel (Cardiff), Kodi Stone (Cardiff); Harri Ford (Dragons), Rhodri Lewis (Scarlets); Ioan Emanuel (Bath), Harry Thomas (Scarlets), Kian Hire (Ospreys), Jonny Green (Harlequins), Nick Thomas (Dragons), Ryan Woodman (Dragons, capt), Morgan Morse (Ospreys), Owen Conquer (Dragons).
Replacements: Isaac Young (Scarlets), Jordan Morris (Dragons), Sam Scott (Bristol Bears), Osian Thomas (Leicester Tigers), Will Austin (Sale Sharks), Ieuan Davies (Bath), Harri Wilde (Cardiff), Louie Hennessey (Bath).
