The 27-year-old Super Falcons forward achieved the feat after scoring 20 goals in 19 league appearances and will share the award with Brazilian Geyse Ferreira, who managed 20 goals in 27 appearances for Madrid CFF.
The award was confirmed on Sunday after Barcelona finished the season with a 2-1 victory against Atletico Madrid at Estadi Johan Cruyff. In the game that saw both teams reduced to ten players, Oshoala was introduced in the 63rd minute for Jenifer Hermoso but she could not add to her tally of goals.
Barcelona scored through Irene Paredes in the 11th minute before Aitana Bonmati made it 2-0 in the 23rd minute. Amanda Sampedro pulled a goal back for Atletico in the 64th minute but this was after their player Merel van Dongen has been sent off for a second bookable offense.