Governing body SANZAAR said Tuesday that 20-minute red cards will be among the rules changes for the 2024 Rugby Championship, which starts Saturday.
In certain cases under the new rules, players sent off after being shown a red card can be replaced by another player 20 minutes later.
Tickets for the 2024 Wallabies home Test season are available here.
The rationale is that individual players, not the match, are punished for some red card offences, SANZAAR said in a statement.
However, deliberate foul play with a high level of danger will still result in a full red card for the offending player, who can neither return nor be replaced, SANZAAR added.
The tournament kicks off with Australia hosting world champions South Africa in Brisbane on Saturday.
Holders New Zealand face Argentina in Wellington later the same day.
A countdown clock of 60 seconds for kickers to take conversions and penalties is among the other rules changes being introduced this season.
Forward packs will also have 30 seconds to form a scrum or line-out.
The new laws also include extra protection for the scrum-half, who can't be tackled within a metre at the base of a scrum, maul or ruck.
The referee will be allowed to let play continue for a crooked lineout throw under the changes if the defending team does not contest the ball.
"The Rugby Championship is the flagship of the sport in the southern hemisphere and annually we see the best players in the world battle it out for the title.
"We believe this year's championship, that has been keenly anticipated by the players and rugby fans, will again exhibit the best of what the game has to offer with exciting, tough action on the field, enhanced by the evolution in the Laws of the Game."
"SANZAAR on behalf of its member unions continues to explore ways to make The Rugby Championship and rugby in general even more attractive to fans.
"In 2024 The Rugby Championship is back to its full format with 12 Test matches played across Argentina, Australia, New Zealand and South Africa.
"The Rugby Championship kicks-off on Saturday 10 August when Australia hosts the reigning world champions South Africa in Brisbane, and New Zealand hosts Argentina in Wellington."
