The former Ipswich striker has started just seven games for the Black Cats since joining in June 2011 but came off the bench to score in their 2-2 draw at the Reebok Stadium on Saturday.
And the Colchester-born 19-year-old hopes he can now enjoy a change of fortunes in the North East as he aims to turn his dream move into a success.
"It's always my aim to be in there in the manager's plans and hopefully the goal has put me in an even better position," said Wickham.
"I didn't think I was going to get on but when I did I was able to make a difference. We were 2-0 down so I thought 'There's nothing to lose, just get on there and do your best'.
"It's been really tough for me. I've moved 300 miles away from where I grew up and left my home behind - but it's my dream and you've got to follow your dream.
"I just want to play football and Sunderland are a Premier League club and they've given me the chance to play football.
"Maybe it didn't get off to the perfect start, the start I'd hoped for or anticipated, but now I feel much fitter and stronger and feel as though I'm kicking on.
"Hopefully, this can be a real kick-start to my season."