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I think you won't be able to do much with your existing rucksack, but there are many out there specifically designed to avoid the sweaty back. Deuter make a range of rucksacks with their Airstripe...
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#1: Attribution notice removed
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System
·
2020-05-27T11:08:43Z (over 4 years ago)
Source: https://outdoors.stackexchange.com/a/4627 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/