The ornamental design for a portablesaunaenclosure, as shown and described.
FIG. 1 is a top front perspective view of the portable sauna enclosure;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a right elevation view thereof;
FIG. 5 is a left elevation view thereof;
FIG. 6 is a top elevation view thereof; and,
FIG. 7 is a bottom elevation view thereof.
The broken lines in FIGS. 1 and 4 depict portions of the portable sauna enclosure that form no part of the claimed design; the broken lines form no part of the claimed design.