We don't have a state-defined national sport nor a regional sport.. But this is the pattern when you ask Indonesians about national sport:
Football, yeah the eleven-a-side game is obviously popular in term of following and fans. It comes in package with supporter boxing
Badminton, often erroneously cited as the national sport. The best sport in term of competitiveness and success, on term of participation maybe neck-to-neck with football. Not as popular as it used to be but the Asian Games really skyrocketed the TV ratings.
Pencak silat, often called the national support because it is (said that) originated from the country. However I can guarantee 11 out of 10 people you ask in the streets won't know how the scoring of tanding (the kumite/kyorugi equivalent) works. Only followed during National Games or SEA Games.
Sepak takraw is also regarded as the native sport (however once again, the claim was disputed and questionable) and once again people only watch during the National Games, SEA Games, or Asian Games.
Some region also have their traditional sporting activities such as:
Fahombo, a coming-of-age native ritual for teenage boys in Nias Island where they must able to jump over a 2 meter stone structure. (when I was younger I've always thought the Nias people should fare well in Olympic high jump)
Pathol, a beach-wrestling game originated in Rembang used to find a fit soldier to guard port of Tuban.
Tarung Derajat, a kickboxing style combat sport developed by Haji Ahmad Drajat from West Java, hence the name. (it is a demonstration sport in 2011 SEA Games)