Taylor is only available for the first two and last two matches of the home and away season plus the finals if the Strikers progress that far. Winfield will fill in for Taylor in the middle 10 games of the season.
Taylor, 28, signs after parting ways with Sydney Thunder having played 58 matches there over the first four WBBL seasons, including winning a title in her first year.
Winfield, 29, has played for both Brisbane Heat and Hobart Hurricanes in the WBBL but did not play in last season's tournament. She played all three T20Is during the women's Ashes and finished as England's leading scorer from limited opportunities.
Meanwhile, Brisbane Heat have completed their list for the new season which starts on October 18 by bringing in New Zealand allrounder Maddy Green. She has played 40 T20Is although her standout international performance was hitting 122 in New Zealand's record total of 491 for 4 against Ireland in 2018.