In general, no.
If you're thinking about a protected form, with the fields in a table, then
yes, the tab key jumps to the next field which may be in a non-adjacent
cell. If you want it to jump to some field other than the next
(left-to-right, then down a row),
it's doable but it takes a macro. See
http://word.mvps.org/FAQs/TblsFldsFms/SetTabOrder.htm.
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Regards,
Jay Freedman
Microsoft Word MVP FAQ: http://word.mvps.org
Regards,
Klaus