Making his 123rd appearance for Denmark, Eriksen notched up his second assist in the 40th minute, teeing up striker Wind to score, and he finally got on the scoresheet himself in second-half stoppage time as a speculative cross caught San Marino keeper Elia Benedettini napping.
The 30-year-old's switch to the Red Devils completes an incredible return after his brush with death last year.
Eriksen was given the green light by doctors last month to resume his playing career.
Denmark have not reached a major tournament semi-final since lifting the trophy 29 years ago.
Denmark will be playing their first game away from Copenhagen's Parken Stadium when they take on Wales in their Euro 2020 last 16 tie on Saturday.
Eriksen could leave the Serie A club next month after struggling to settle in Italy following his transfer from English Premier League side Tottenham Hotspur.
Eriksen’s penalty on his 100th appearance for Denmark earned his side a 1-0 win over England in their Nations League clash at Wembley.
Inter Milan have signed Denmark playmaker Christian Eriksen from Tottenham Hotspur on a 4-1/2 year contract after the two clubs agreed the midfielder’s transfer, both sides announced on Tuesday.
Peru Oselio, sports director of the Italian club Inter Milan, announced that his club made an official offer to sign the Danish star Christian Eriksen from Tottenham.
Christian Eriksen's superb opener was cancelled out by Mile Jedinak's penalty as Denmark and Australia drew 1-1 at the World Cup on Thursday to ensure Group C would go down to the final round of matches.
Making their return to the World Cup finals after a 36-year absence, the South Americans will provide a stern test for Age Hareide's Denmark side.
Christian Eriksen maintained his hot goalscoring streak, striking both goals in Tottenham Hotspur's 2-1 win at struggling Stoke City to extend Spurs' winning sequence on Saturday.
Tottenham Hotspur's Christian Eriksen scored twice in a 3-0 victory at Swansea City as the north London club breezed into the FA Cup semi-finals on Saturday.
Christian Eriksen played a big role in his country's World Cup finals, with a 3-1 win over Ireland on Tuesday.