The 32-year-old Harmanpreet had a previous stint with Sydney Thunder but it will be a debut season for the 21-year-old Rodrigues in the WBBL, beginning October 14.
Shafali Verma and Radha Yadav have been signed up by Sydney Sixers.
"It means a lot (to be back). The WBBL has given me a lot of experience and a great platform where I can perform and execute," Harmanpreet was quoted as saying on the team's website.
"Coming back with a new team, the Renegades. I hope this season will be really great for us. It's my first season with them and I definitely want to make an impact.
For 21-year-old Rodrigues, it will be a debut season, beginning October 14. Shafali Verma and Radha Yadav have been signed up by Sydney Sixers.
"For me, the main goal over here will be just to pull back and play cricket, play some good cricket and enjoy what I’m doing. I know when I do that and when I'm in that headspace, I'm able to give it my best," Rodrigues was quoted as saying by cricket.com.au.
Rodrigues was not part of the Indian team that lost the ODI series 1-2 to hosts Australia but she had a decent stint in the recent Hundred series where she scored 249 runs in seven innings for the Northern Superchargers.
"The goal is whatever happens, I want to give it my 100 per cent each and every time I'm on the field… and hopefully (we can win) the cup for the Renegades.
"I'm super excited, I'm really looking forward to it and there’s so much that I'm going to learn, I'm sure about that," she said.
Renegades coach Simon Helmot was impressed with the way Rodrigues played in 'The Hundred'
"Jemimah is an immensely talented young player, who is already making her mark on the world stage at 21," the coach said.
"She was superb recently in The Hundred over in the UK. She's is a dynamic player who can score quickly and to all parts of the ground."