The Irishman admitted to a feeling of excitement at the thought of learning the identity of his semi-final opponents when the draw is made next Thursday.
But the relief felt at coming through a penalty shoot-out against Aberdeen in Tuesday night's quarter-final at Pittodrie, sat in contrast to the anxiety experienced by Goodwin thoughout the game as he sought to avoid the booking that might have ruled him out of January's semi-finals.
For the tough-tackling Goodwin, escaping Crawford Allan's notebook, was no mean feat, even if there was a moment when the player himself feared he might have been the victim of a case of mistaken identity.
"I walked a tightrope for a long time, but I didn't get booked, said the St Mirren captain. "I saw the referee take his card out in the corner. I was running away from him and so I asked him if he had booked me but he said he hadn't. He was noting David van Zanten's booking.
"I thought I might have been booked because [Niall McGinn] went past and I had a kick at him, but then Vanzy [van Zanten] did it and put it out for a corner. The referee took his notepad out for Vanzy's booking and that is where the confusion comes from. I know I definitely wasn't booked and I will be eligible for the semi-finals. I have never played at Hampden, so it will be good to play there."
Certainly, Danny Lennon, the St Mirren manager, would have viewed his captain's absence as a major blow, given the Irishman's undoubted contribution as a ball-winning and stabilising force. His work-rate, indicative of his exceptional fitness in the busiest area of the pitch, is none too shabby either and St Mirren's progress was just reward for Goodwin, even if he did concede that he was to blame for denying his side the victory in 90 minutes.
St Mirren were heading for the win when Aberdeen grabbed a late equaliser through Josh Magennis to take the tie into extra time.
"I was beating myself up over their equaliser because it was my fault," he said. "The ball was cutback and I was too slow in getting out and I played Magennis onside. I was then hoping somebody was going to dig me out of the hole. I didn't think Aberdeen deserved the equaliser at that time. We were under pressure for the first five to 10 minutes but I thought we coped well with everything they threw at us after that. I thought our two centre halves were excellent and big [Marc] McAusland had the game of his life."
Stephen Hughes' miss –Aberdeen's first penalty kick – did little for his side's confidence, and when Cammy Smith, the 17-year-old striker, had his effort saved by the outstretched hand of Craig Samson in the St Mirren goal, the visitors were through 4-2 on penalties, which prompted euphoric scenes among the small band of Paisley supporters.
"Penalties are a lottery," said Gavin Rae, the Aberdeen midfielder. "Fair play to Cammy. He was really confident and he wanted one. You have to commend that and I have told him not to worry about it. That sort of thing happens and it happens to the best players in the world. I told him to keep his head up and just to get on with it."