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Japan's Sato, who has raced for Jordan, Honda and Super Aguri in F1, set the fastest times of the three at Spain's Circuit de Catalunya.
BBC: Buemi poised for Toro Rosso seat
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However, he has not competed since this year's Spanish Grand Prix in April, when Honda-backed Super Aguri went out of business.
BBC: Sato to test for Toro Rosso again
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The support from Magma Group, led by former Ford and Maserati executive Martin Leach, ends fears that the Honda-powered Super Aguri would be unable to take part in the Australian Grand Prix at Melbourne on Sunday.
CNN: Magma Group come to aid of Super Aguri