Since joining the club as its inaugural captain in WBBL|01, Perry has played in 70 matches for the Sixers, amassing a competition-record 2612 runs, whilst also claiming 32 wickets.
The 29-year-old led the side to four consecutive WBBL finals, securing back-to-back titles in WBBL|02 and WBBL|03.
Perry was named Player of the Tournament in WBBL|04 after breaking the record for most runs in a single season with 777.
Sixers General Manager Jodie Hawkins said the club is delighted to have extended Perry's stay with the club.
“Ellyse has been a part of the Sixers from the very beginning. She was our first ever ambassador back in BBL01 and joined us as captain in WBBL01," Hawkins said.
"She not only plays for the Sixers but is also involved in our program development. We look forward to her not only continuing to play, but also leaving her mark on the Club for years to come."
Sixers WBBL Head Coach Ben Sawyer emphasised how pleased he was to retain such a valued member of the club.
"Ellyse has been our captain from the very beginning of this competition and we are extremely happy that she has extended her contract with us for the next 2 seasons," Sawyer said.
"On the field, Ellyse has been amazing for us throughout the history of the WBBL, but she is so much more to our club than just her on field performances.
“Ellyse has played an immeasurable role in the structure and philosophy of our club and, along with our other senior players, both Australian and International, has always had our club and it’s long term success at heart."