If I have qantas club and am flying MAS can I access the lounge in KLIA?

If I have qantas club and am flying MAS can I access the lounge in KLIA?

No, because you're neither flying Qantas nor visiting a Qantas lounge.

Here's what the Qantas website says

Each time you travel on a Qantas or Jetstar flight number you will have access to:

• All Qantas Club lounges when travelling within Australia
• All Qantas International Business Lounges when travelling overseas
• Emirates Business Lounge in Dubai
• American Airlines Admirals Club lounges in London and other locations
• Associated lounges in most international ports that Qantas flies to but where there is no Qantas or partner airline lounge. Our associated lounges are operated by, or on behalf of, other airlines