When was the last time Australia had two players playing in a Test match from the same cricket club?

Peter Handscomb and Todd Murphy both play for St Kilda in Victoria Premier Cricket

Peter Siddle and James Pattinson both were from Dandenong when they played together in the 1st Test of the 2019 Ashes Series.

There would have been many over the years.

In 1977/78 Western Suburbs had 3 players in the same Test team - Bob Simpson, Peter Toohey and Steve Rixon.

In the 1980s Greg Matthews played with David Gilbert.

Michael Clarke and Phillip Hughes played Test cricket together and in December 2011 against New Zealand Michael Clarke, Phillip Hughes and Mitchell Starc all played in the same Test team. It was Mitchell Starc Test debut and they may have played together in other Tests as well