Can I extend my tourist visa in Thailand two times for 30 days each?

No but you can apply for the 60 day unable to travel due to Covid extension

Only one 30 days extension is possible.

You can switch to the 60 day covid extension instead.

You’ll need this stuff. Not all offices have the same requirements so it may be slightly different depending on which of the 70+ offices you use.

A copy of your passport data page (signed),

A passport photo,

Proof of filing a TM30,

A copy of your departure card (TM6) (signed)

A copy of your latest entry stamp (signed)

A copy of any previous Covid extension stamps (signed) (Phuket requires this other offices may not)

In Phuket they require the copies to be in portrait not landscape. This means the top of your passport aligns along the shorter side of the A4.

(Other offices may not be as pedantic)

A filled out TM7 (application form for extensions) - the form doesn’t have a space for your email or phone number but just write it on the back (page 2).

A filled out STM2 (acknowledgement that you understand the rules for overstaying)

A filled out “I don’t want to leave because of Covid form” - I have no idea if it has an official name or number.

And 1,900 baht.

The forms are available at your local office. Most have places on site or nearby that can do the copies and photos.

No. Once is the limit. However you may apply for a “unable to travel due to Covid” extension which will give you an extra 60 days. Changing from a extension from a tourist visa to a Covid extension they will usually stamp you from the day you apply not from the date of your current stamp so don’t apply too early.