The Polish team won 21:25, 25:17, 25:17, 25:17 at home in the southern city of Jastrzębie-Zdrój on Wednesday night, the interia.pl website reported.
The victory over Ceske Budejovice means Jastrzębski Węgiel have now won four out of four games in the 2023/24 Champions League, sport.pl reported.
The Polish champions top the competition's group D.
Jastrzębski Węgiel reached the final of the 2022/23 Champions League, where they lost 3-2 to Zaksa Kędzierzyn Koźle in an all-Polish final in Turin in May.
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Source: interia.pl, sport.pl, European Volleyball Confederation CEV