Vangsgaard scored 11 goals in 62 appearances during a two-year spell at Italian giants, having joined from Paris Saint-Germain in 2024.
The forward has also previously represented Linköpings, Nordsjælland, Ballerup-Skovlunde, and Fortuna Hjorring.
Vangsgaard has 46 Denmark caps to her name, having made her debut back in 2022, and has scored 14 goals on the international stage. She was one of the key players as Denmark managed to qualify for the Women's World Cup in Brazil next year.
Marisa Ewers, Director of Women’s Football, said: “She’s a player with proven quality and experience at the highest level, and we’re delighted to bring her to Aston Villa."
“She will add valuable quality to the group as we continue building towards our ambitions for the new season.”