@Günter *******
You *should* be able to, if you meet the following conditions, and the immigration office is willing to sell you the visa.
1. You need to have 800,000 THB in a Thai bank account, marked as being sent from overseas. OR income of 65,000 THB from overseas from a pension, OR a letter from your embassy saying you have 65,000 THB of money from overseas.
2. You have 15 days or more remaining on your current "ADMITTED TO" stamp or "Extension of stay".
3. A criminal background check from the Thai police.
4. A fee of 2,000 THB
IF you do, go to the local immigration and apply for a "zero entry Non-O visa". This is valid for 90 days.
When you have 30 days remaining on the Non-O visa (45 days for some immigration offices), you will go to the immigration office and ask for a one year extension of stay based on retirement. You will need:
1. 1. Your passport and:
a. a copy of your data ("picture") page
b. a copy of your most recent visa (if you have one)
c. a copy of your most recent stamp
d. a copy of your departure card
2. A TM30, filed in the immigration office.
3. A letter from the bank showing you have the money seasoned for two months.
4. 1,900 THB fee
Once the extension of stay is granted, then you will apply for a multiple entry re-entry permit. This is 3,800 THB. You will need
1. Your passport and a copy of:
a. The data “picture” page.
b. The most recent entry stamp or extension of stay.
c. Your departure card (“TM 6”) that should be stapled in your passport.
2. A TM 8 “Application for Re-entry permit” form
3. 2x passport photos
4. 3,800 THB fee
Retirement visas aren't my forte so I'll let others chime in if I'm wrong.