I just recently found a Japanese course for learning Sundanese (スンダ語を勉強しましょう!), with several lessons. As English material for learning Sundanese is non-existant on the internet, and as the lessons seem to be fairly simple, I thought I'd translate a few for anyone interested.
Just a note, I've never studied Sundanese or Indonesian so I won't be able to help with any questions, all I'm doing is translating the Japanese (try the Phrasebase forum if you have any questions).
1. About Sundanese
From 60 years ago until the current time, before Indonesia achieved independence, Indonesian was not a common language in the community, and the language used differed according to its people. People living in Java spoke Javanese, people living in Sumatra spoke Minangkabau, people living in Bali spoke Balinese and people living in Bandung in West Java continued to use Sundanese. The language that Indonesian children study at school is Indonesian but even now, people living in West Java speak the community language Sundanese. There are 27 million of these speakers.
First of all, about the Sundanese language, there are a few similarities with Japanese. That is, the language can be split into polite and everyday expressions.
The 3 politeness levels are, in order of politness, from most to least:
"Bahasa Halus (Lemes)"
"Bahasa Sedeng"
"Bahasa Kasar"
For example, the word 'I', according to the speaker and the situation, can be said as "Pun", "Abdi" and "Urang". Another one, "Aing" is used when talking to children, and when talking with close friends.
2. Well then, let's study Sundanese!
I have written these conversations and texts for people studying Sundanese for the first time. Lastly, I have also included vocabulary lists for learning basic Sundanese. If you learn everything and use it in real life, you can make friends with people living in Bandung. Good luck and study hard.